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The axial skeleton system contains how many bones?
Explanation The axial skeleton system consists of the bones that make up the central axis of the body, including the skull, vertebral column, and rib cage. It provides support and protection for vital organs. The statement "80 bones" indicates that the axial skeleton system contains a total of 80 bones.
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2.
What are the 3 major regions of the Axial Skeleton?ABC order
Explanation The question is asking for the three major regions of the Axial Skeleton. The Axial Skeleton consists of the skull, thoracic cage, and vertebral column. The skull includes the bones of the cranium and the facial bones. The thoracic cage includes the ribs and sternum. The vertebral column consists of the vertebrae, which protect the spinal cord. These three regions are essential for providing support and protection to the vital organs of the body.
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3.
Name two sets of skull bones?
Explanation The correct answer is cranial facial bones. The skull is made up of two sets of bones, the cranial bones and the facial bones. The cranial bones form the structure of the skull and protect the brain, while the facial bones make up the structure of the face. Together, these two sets of bones provide support and protection for the head and face.
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4.
What site provides attachment for the head and neck?Cranial or Facial Bones?
Explanation The correct answer is cranial bones. Cranial bones provide attachment for the head and neck. These bones form the structure of the skull and protect the brain. They include the frontal, parietal, temporal, occipital, sphenoid, and ethmoid bones. The cranial bones are responsible for providing support and protection to the brain and also serve as attachment points for muscles involved in head and neck movement.
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5.
Site of attachment for teeth and muscles?Cranial or facial?
Explanation The correct answer is facial because the site of attachment for teeth and muscles is primarily located in the face. The facial bones, such as the maxilla and mandible, provide the attachment points for teeth, while the facial muscles, like the masseter and orbicularis oris, are responsible for movements involved in chewing and facial expressions. Therefore, the facial region is directly involved in the attachment and functioning of teeth and muscles.
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6.
* Anterior portion of cranium * Most of anterior cranial fossa* Superior wall of orbits* Contains air-filled frontal sinusName bone?
Explanation The correct answer is the frontal bone. The frontal bone is located in the anterior portion of the cranium and makes up most of the anterior cranial fossa. It also forms the superior wall of the orbits and contains the air-filled frontal sinus.
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7.
What suture lies between parietal bones and frontal bone?
Explanation The coronal suture is the correct answer because it is the suture that lies between the parietal bones and the frontal bone. Sutures are fibrous joints that connect the bones of the skull, and the coronal suture specifically runs horizontally from one side of the skull to the other, separating the frontal bone from the parietal bones. It is named after its resemblance to a crown when viewed from above.
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8.
What suture lies between right and left parietal bones?
Explanation The sagittal suture is the correct answer because it is the suture that runs along the midline of the skull, separating the right and left parietal bones. This suture is important for the growth and development of the skull, as well as providing stability and protection to the brain.
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9.
What suture lies between parietal and temporal bones on each side of skull?
Explanation The suture that lies between the parietal and temporal bones on each side of the skull is called the squamous suture. This suture is a type of fibrous joint that connects these two bones and allows for slight movement. It is named "squamous" due to the scale-like appearance of the overlapping edges of the bones at this suture. The squamous suture is important for maintaining the structural integrity of the skull and protecting the underlying brain.
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10.
* Most of skulls posterior wall and posterior cranial fossa.* Articulates withe 1st vertebra* Sites of attachment for the ligamentum nuchae and many neck and back muscles Name Bone?
Explanation The given correct answer is "Occipital Bone". The explanation for this answer is that the occipital bone is located at the posterior part of the skull and forms the posterior wall of the skull and the posterior cranial fossa. It articulates with the first vertebra, known as the atlas, and provides attachment sites for the ligamentum nuchae and various neck and back muscles.
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11.
* Inferolateral aspects of skull and parts of cranial floor* Four major regions: *Squamous * Tympanic * Mastiod * PetrousName Bone?
Explanation The given answer, Temporal Bone, is correct because the inferolateral aspects of the skull and parts of the cranial floor are indeed associated with the Temporal Bone. The Temporal Bone consists of four major regions: Squamous, Tympanic, Mastoid, and Petrous. Therefore, Temporal Bone is the appropriate bone that matches the given description.
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12.
Complex, bat-shaped bone
Keystone bone
◦ Articulates with all other cranial bones
Three pairs of processes
◦ Greater wings
◦ Lesser wings
◦ Pterygoid processesName bone?
Explanation The bone described in the question is the sphenoid bone. It is a complex, bat-shaped bone that acts as a keystone bone in the cranial skeleton, articulating with all other cranial bones. It has three pairs of processes, including the greater wings, lesser wings, and pterygoid processes.
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13.
Deepest skull bone
Superior part of nasal septum, roof of nasal cavities
Contributes to medial wall of orbits
Name Bone?
Explanation The ethmoid bone is the correct answer because it is the deepest skull bone, forms the superior part of the nasal septum and the roof of the nasal cavities, and contributes to the medial wall of the orbits.
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14.
Tiny irregularly shaped bones that appear within sutures
Explanation Sutural bones are tiny irregularly shaped bones that appear within sutures. Sutures are the fibrous joints between the bones of the skull, and sutural bones can sometimes be found within these joints. These bones are not present in every individual and can vary in number and shape. They are considered to be accessory bones and are thought to result from the incomplete fusion of the bones of the skull during development. Sutural bones are typically harmless and do not cause any functional issues.
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15.
Mandible
Maxillary bones (maxillae) (2)
Zygomatic bones (2)
Nasal bones (2)
Lacrimal bones (2)
Palatine bones (2)
Vomer
Inferior nasal conchae (2)
What bone is this found?
Explanation The given list includes various bones of the face, such as the mandible, maxillary bones, zygomatic bones, nasal bones, lacrimal bones, palatine bones, vomer, and inferior nasal conchae. All of these bones are part of the facial bone structure. Therefore, the correct answer is Facial Bone.
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16.
Lower jaw
Largest, strongest bone of face
Temporomandibular joint: only freely movable joint in skullWhat bone is this found?
Explanation The correct answer is mandible. The mandible is the lower jaw bone and is the largest and strongest bone in the face. It is responsible for the movement of the jaw and is connected to the skull by the temporomandibular joint, which is the only freely movable joint in the skull.
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17.
Medially fused to form upper jaw and central portion of facial skeleton
Keystone bones
◦ Articulate with all other facial bones except mandibleName Bone?
Explanation The maxillary bones are medially fused to form the upper jaw and central portion of the facial skeleton. They are also known as the keystone bones because they articulate with all other facial bones except the mandible. Therefore, the correct answer is Maxillary Bones.
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18.
Cheekbones
Inferolateral margins of orbits Name Bone?
Explanation The question is asking for the name of the bone that includes the cheekbones and the inferolateral margins of the orbits. The correct answer is the Zygomatic Bones. The zygomatic bones are located in the face and contribute to the structure of the cheekbones and the sides of the eye sockets. They are commonly referred to as the cheekbones and play a role in facial symmetry and support.
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19.
Form bridge of nose?
Explanation The nasal bones are responsible for forming the bridge of the nose. They are two small, oblong bones that are located at the upper part of the nose, between the frontal bone and the maxilla. These bones contribute to the overall shape and structure of the nose, providing support and stability.
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20.
◦ In medial walls of orbits
◦ Lacrimal fossa houses lacrimal sac Name Bone?
Explanation The lacrimal bones are located in the medial walls of the orbits. They are responsible for housing the lacrimal sac, which is involved in the production and drainage of tears.
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21.
◦ Posterior one-third of hard palate
◦ Posterolateral walls of the nasal cavity
◦ Small part of the orbits
Name Bone?
Explanation The palatine bones are located in the posterior one-third of the hard palate, the posterolateral walls of the nasal cavity, and a small part of the orbits. Therefore, the correct answer is Palatine Bones.
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22.
◦ Plow shaped
◦ Lower part of nasal septumName Bone?
Explanation The correct answer is Vomer Bone. The vomer bone is located in the lower part of the nasal septum and has a plow-shaped appearance. It helps to separate the nasal passages and support the nasal structure.
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23.
Form part of lateral walls of nasal cavity?
Explanation The correct answer is the inferior nasal concha. The inferior nasal concha is a bone that is located in the nasal cavity and forms part of the lateral walls. It helps to increase the surface area of the nasal cavity and plays a role in filtering, warming, and humidifying the air that is inhaled through the nose.
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24.
Not a bone of the skull
Does not articulate directly with another bone
Site of attachment for muscles of swallowing and speech
Name Bone?
Explanation The hyoid bone is not a bone of the skull and does not articulate directly with another bone. It is located in the neck and serves as the site of attachment for muscles involved in swallowing and speech.
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25.
Transmits weight of trunk to lower limbs
Surrounds and protects spinal cord
Flexible curved structure containing 26 irregular bones (vertebrae)Name Bone?
Explanation The vertebral column, also known as the spine or spinal column, is a flexible curved structure consisting of 26 irregular bones called vertebrae. It surrounds and protects the spinal cord, which is a vital part of the nervous system. Additionally, the vertebral column transmits the weight of the trunk to the lower limbs, providing support and stability to the body.
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26.
Bone inferior to the lumbar vertebrae?
Explanation The sacrum is the bone that is inferior to the lumbar vertebrae. It is a triangular-shaped bone located at the base of the spine, formed by the fusion of five vertebrae. The lumbar vertebrae are the five vertebrae that are found in the lower back region of the spine. Therefore, the sacrum is the correct answer as it is the bone that is positioned below the lumbar vertebrae.
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27.
Terminus of vertebral column?
Explanation The coccyx is the correct answer because it is the terminus or the end of the vertebral column. The vertebral column is made up of several vertebrae, and the coccyx, also known as the tailbone, is the final segment of these vertebrae. It consists of three to five fused vertebrae and is located at the bottom of the spine. The coccyx plays a role in supporting the body while sitting and also serves as an attachment point for various muscles and ligaments.
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28.
What is the Anterior weight-bearing region?
Explanation The anterior weight-bearing region refers to the part of the body or centrum that bears the majority of the weight. This could be the front portion of the body or the central part of the body's structure, such as the vertebral centrum.
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29.
Composed of pedicles and laminae that, along with centrum, enclose vertebral foramen?
Explanation The vertebral arch is composed of pedicles and laminae that, along with the centrum, enclose the vertebral foramen. The pedicles are short, thick processes that connect the vertebral body to the laminae, which are thin, flat plates that extend from the pedicles to form the posterior portion of the vertebral arch. Together, the pedicles and laminae create a bony ring that surrounds and protects the spinal cord within the vertebral foramen. Therefore, the vertebral arch is the correct answer to the question.
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30.
Together make up vertebral canal for spinal cord
Explanation The vertebral foramina are the openings in the vertebrae that, when stacked together, form the vertebral canal. The vertebral canal houses and protects the spinal cord. Therefore, the statement "Together make up vertebral canal for spinal cord" is a correct explanation for the term "vertebral foramina."
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31.
Lateral openings between adjacent vertebrae for spinal nerves ?
Explanation The lateral openings between adjacent vertebrae that allow the spinal nerves to pass through are called intervertebral foramina. These foramina are formed by the alignment of the vertebral notches on the superior and inferior surfaces of adjacent vertebrae. The spinal nerves exit the spinal cord through these openings and then branch out to innervate different regions of the body.
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32.
◦ No body or spinous process
◦ Consists of anterior and posterior arches, and two lateral masses
◦ Superior surfaces of lateral masses articulate with the occipital condyles Which Vertebrae?
Explanation The given description of the vertebrae matches the characteristics of the Atlas vertebrae. The Atlas is the first cervical vertebrae and is unique in that it lacks a body and spinous process. Instead, it consists of anterior and posterior arches, as well as two lateral masses. The superior surfaces of the lateral masses articulate with the occipital condyles, allowing for the nodding motion of the head. Therefore, the correct answer is Atlas.
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33.
◦ Dens projects superiorly into the anterior arch of the atlas◦ Dens is a pivot for the rotation of the atlas Name Vertebrae?
Explanation The correct answer is Axis. The axis is the second cervical vertebra in the spine. It has a bony projection called the dens or odontoid process, which extends superiorly into the anterior arch of the atlas (the first cervical vertebra). This dens acts as a pivot point for the rotation of the atlas, allowing for the movement of the head.
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34.
◦ All articulate with ribs at facets and demifacets
◦ Long spinous process
◦ Location of articular facets allows rotation of this area of spineName Vertebra?
Explanation The given characteristics of the vertebra, such as articulation with ribs at facets and demifacets, a long spinous process, and the location of articular facets allowing rotation, are all specific to the thoracic vertebrae. Therefore, the correct answer is thoracic.
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35.
◦ Short, thick pedicles and laminae
◦ Flat hatchet-shaped spinous processes
◦ Orientation of articular facets locks lumbar vertebrae together so as to prevent rotation
Name Vertebra?
Explanation The given characteristics of short, thick pedicles and laminae, flat hatchet-shaped spinous processes, and orientation of articular facets that lock lumbar vertebrae together suggest that the correct answer is Lumbar. These features are specific to the lumbar vertebrae and help to distinguish them from other vertebrae in the spine.
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36.
◦ 5 fused vertebrae (S1–S5)
◦ Forms posterior wall of pelvis
◦ Articulates with L5 superiorly, and with auricular surfaces of the hip bones laterally Name Bone?
Explanation The bone that is being described in the given information is the sacrum. The sacrum is made up of 5 fused vertebrae (S1-S5) and forms the posterior wall of the pelvis. It articulates with the L5 vertebra superiorly and with the auricular surfaces of the hip bones laterally.
Explanation The given answer, Coccyx, is correct because the description provided matches the characteristics of the coccyx bone. The coccyx is made up of 3-5 fused vertebrae, commonly known as the tailbone. It articulates superiorly with the sacrum, which is the triangular bone at the base of the spine. Therefore, the correct bone name based on the given information is the coccyx.
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38.
◦ Composed of
◦ Thoracic vertebrae
◦ Sternum
◦ Ribs and their costal cartilages
◦ Functions
◦ Protects vital organs of thoracic cavity
◦ Supports shoulder girdle and upper limbs
◦ Provides attachment sites for many muscles, including intercostal muscles used during breathing
Explanation The thoracic cage is composed of thoracic vertebrae, sternum, and ribs with their costal cartilages. It functions to protect the vital organs of the thoracic cavity, support the shoulder girdle and upper limbs, and provide attachment sites for many muscles, including the intercostal muscles used during breathing. The correct answer is "Thoracic cage" because it accurately describes the structure and functions mentioned in the given information.
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39.
Three fused bones
◦ Manubrium
Articulates with clavicles and ribs 1 and 2
◦ Body
Articulates with costal cartilages of ribs 2 through 7
◦ Xiphoid process
Site of muscle attachment
Not ossified until ~ age 40Name Bone?
Explanation The given description matches the structure and function of the sternum. The sternum is composed of three fused bones: the manubrium, body, and xiphoid process. The manubrium articulates with the clavicles and the first two ribs, while the body articulates with the costal cartilages of ribs 2 through 7. The xiphoid process serves as a site of muscle attachment and is not fully ossified until around the age of 40. Therefore, the correct answer is sternum.
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40.
Bones of the limbs and their girdles
◦ Pectoral girdle attaches the upper limbs to the body trunk
◦ Pelvic girdle secures the lower limbs
Explanation The correct answer is "Appendicular skeleton." The appendicular skeleton refers to the bones of the limbs and their girdles. The pectoral girdle attaches the upper limbs to the body trunk, while the pelvic girdle secures the lower limbs. The appendicular skeleton is responsible for the movement and support of the body's limbs and plays a crucial role in locomotion.
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41.
Clavicles and the scapulae
◦ Attach the upper limbs to the axial skeleton
◦ Provide attachment sites for muscles that move the upper limbs
Explanation The pectoral girdle refers to the clavicles and scapulae, which attach the upper limbs to the axial skeleton. They also provide attachment sites for muscles that move the upper limbs. Therefore, the pectoral girdle is the correct answer because it encompasses both the clavicles and scapulae and their functions in relation to the upper limbs and axial skeleton.
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42.
Flattened acromial (lateral) end articulates with the scapula
Cone-shaped sternal (medial) end articulates with the sternum
Act as braces to hold the scapulae and arms out laterally
Explanation The clavicles are bones that connect the scapulae (shoulder blades) to the sternum (breastbone). The flattened acromial (lateral) end of the clavicle articulates with the scapula, while the cone-shaped sternal (medial) end articulates with the sternum. The clavicles act as braces, holding the scapulae and arms out laterally, allowing for a wide range of movement in the shoulder joint.
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43.
Situated on the dorsal surface of rib cage, between ribs 2 and 7
Flat and triangular, with three borders and three angles
Seven large fossae, named according to location
Explanation The given description matches the characteristics of the scapula. The scapula is situated on the dorsal surface of the rib cage, between ribs 2 and 7. It is flat and triangular in shape, with three borders and three angles. The scapula also has seven large fossae, which are named according to their location. Therefore, the correct answer is scapula.
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44.
Largest, longest bone of upper limb
Articulates superiorly with glenoid cavity of scapula
Articulates inferiorly with radius and ulna
Explanation The humerus is the largest and longest bone of the upper limb. It articulates superiorly with the glenoid cavity of the scapula, forming the shoulder joint. Additionally, it articulates inferiorly with the radius and ulna, forming the elbow joint.
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45.
Medial bone in forearm
Forms the major portion of the elbow joint with the humerus
Explanation The ulna is the correct answer because it is the medial bone in the forearm and forms the major portion of the elbow joint with the humerus. The ulna runs parallel to the radius and is located on the inner side of the forearm. It helps to stabilize the forearm and provides attachment for muscles that control movement of the wrist and fingers.
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46.
Lateral bone in forearm
Head articulates with capitulum of humerus and with radial notch of ulna
Interosseous membrane connects the radius and ulna along their entire length
Explanation The given information describes the characteristics of the radius bone in the forearm. The radius is the lateral bone in the forearm, meaning it is located on the thumb side. Its head articulates with the capitulum of the humerus (upper arm bone) and the radial notch of the ulna (the other bone in the forearm). Additionally, the radius is connected to the ulna by the interosseous membrane, which runs along the entire length of both bones. Therefore, the correct answer is "Radius."
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47.
Two hip bones (each also called coxal bone or os coxae)
◦ Attach the lower limbs to the axial skeleton with strong ligaments
◦ Transmit weight of upper body to lower limbs
◦ Support pelvic organs
Each hip bone consists of three fused bones: ilium, ischium, and pubis
Together with the sacrum and the coccyx, these bones form the bony pelvis
Explanation The given answer, "Pelvic girdle," is the correct answer because the information provided describes the function and structure of the pelvic girdle. The pelvic girdle, also known as the hip bones or coxal bones, attaches the lower limbs to the axial skeleton, transmits the weight of the upper body to the lower limbs, and supports the pelvic organs. It is made up of the fused bones, ilium, ischium, and pubis, and along with the sacrum and coccyx, forms the bony pelvis. Therefore, the answer accurately identifies the term that encompasses all the information provided.
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48.
◦ Adapted for childbearing
◦ True pelvis (inferior to pelvic brim) defines birth canal
◦ Cavity of the true pelvis is broad, shallow, and has greater capacity
49.
◦ Tilted less forward
◦ Adapted for support of male’s heavier build and stronger muscles
◦ Cavity of true pelvis is narrow and deep
Explanation The male pelvis is adapted for support of a heavier build and stronger muscles compared to the female pelvis. It is tilted less forward and has a narrow and deep cavity in the true pelvis. These adaptations are necessary to accommodate the physical differences between males and females, such as the larger size and greater strength of males.
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50.
Carries the weight of the body
Subjected to exceptional forces
Three segments of the lower limb
◦ Thigh: femur
◦ Leg: tibia and fibula
◦ Foot: 7 tarsal bones in the ankle, 5 metatarsal bones in the metatarsus, and 14 phalanges in the toes
Explanation The lower limb carries the weight of the body and is subjected to exceptional forces. It is divided into three segments: the thigh, leg, and foot. The thigh consists of the femur, the leg consists of the tibia and fibula, and the foot consists of the tarsal bones in the ankle, metatarsal bones in the metatarsus, and phalanges in the toes.
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