Muscles Of The Thorax

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| By Clinical_anatomy

Clinical_anatomy

Community Contributor

Quizzes Created: 4 | Total Attempts: 2,303

Questions: 15 | Attempts: 855 | Updated: Mar 21, 2023

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After looking carefully at the 'Muscles' section of the website, see how much you can recall by testing yourself with the following 15 questions!

Questions and Answers

1.

What are the nerve root values for the nerve that innervates the clavicular head of the pectoralis major muscle
- A.
  
  C3 and C4
- B.
  
  C5 and C6
- C.
  
  C7 and C8
- D.
  
  C7, C8 and T1
Correct Answer
B. C5 and C6

Explanation
The nerve that innervates the clavicular head of the pectoralis major muscle is the lateral pectoral nerve. This nerve arises from the anterior rami of the C5 and C6 spinal nerves.

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2.

What are the nerve root values for the nerve that innervates the sternal head of the pectoralis major muscle?
- A.
  
  C3 and C4
- B.
  
  C5 and C6
- C.
  
  C7 and C8
- D.
  
  C7,C8 and T1
Correct Answer
D. C7,C8 and T1

Explanation
The nerve that innervates the sternal head of the pectoralis major muscle receives its nerve root values from C7, C8, and T1. These nerve roots correspond to specific levels of the spinal cord and are responsible for transmitting signals to the muscle, allowing it to contract and perform its function.

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3.

The pectoralis major muscle is innervated by both the medial pectoral nerve and the lateral pectoral nerve
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The pectoralis major muscle is indeed innervated by both the medial pectoral nerve and the lateral pectoral nerve. These nerves provide motor innervation to the muscle, allowing it to contract and perform its functions. The medial pectoral nerve originates from the medial cord of the brachial plexus and primarily supplies the upper part of the muscle, while the lateral pectoral nerve arises from the lateral cord of the brachial plexus and mainly innervates the lower part of the muscle. Therefore, the statement is true.

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4.

Where does the pectoralis minor muscle insert into?
- A.
  
  Lateral lip of the bicipital groove on the proximal half of the humerus
- B.
  
  Coracoid process of the scapula
Correct Answer
B. Coracoid process of the scapula

Explanation
The pectoralis minor muscle inserts into the coracoid process of the scapula. This is a small, triangular bone that extends from the upper part of the scapula. The insertion of the muscle onto the coracoid process allows it to play a role in moving and stabilizing the scapula during shoulder movements.

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5.

The blood supply of the pectoralis minor muscle is from the lateral thoracic artery
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
It is from the pectoral branch of the acromiothoracic artery

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6.

The pectoralis minor muscle is involved in the protraction of the scapula
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The pectoralis minor muscle is indeed involved in the protraction of the scapula. Protraction refers to the movement of the scapula away from the midline of the body, towards the front of the body. The pectoralis minor muscle, located in the chest, plays a role in this movement by pulling the scapula forward and away from the spine. Therefore, the statement is true.

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7.

The pectoralis minor muscle is innervated by the lateral pectoral nerve
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
It is innervated by the medial pectoral nerve

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8.

The innermost intercostal muscles act with the internal intercostal muscles
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The innermost intercostal muscles are located deep within the intercostal spaces and assist in the process of respiration along with the internal intercostal muscles. These muscles work together to contract and relax during breathing, helping to expand and contract the ribcage and facilitate the movement of air in and out of the lungs. Therefore, the statement that the innermost intercostal muscles act with the internal intercostal muscles is true.

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9.

In what direction to the fibres of the external intercostal muscles point?
- A.
  
  Inferomedially
- B.
  
  Inferolaterally
Correct Answer
A. Inferomedially

Explanation
The fibres of the external intercostal muscles point inferomedially. This means that they run in a downward and inward direction, from the superior rib to the inferior rib. This orientation allows the external intercostal muscles to assist in the elevation of the rib cage during inhalation, aiding in the expansion of the thoracic cavity and facilitating the intake of air into the lungs.

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10.

The internal intercostal muscles are active in the process of inspiration
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
They are active during expiration.

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11.

Which nerve innervates the serratus anterior muscle?
- A.
  
  Lateral pectoral nerve
- B.
  
  Medial pectoral nerve
- C.
  
  Long thoracic nerve
Correct Answer
C. Long thoracic nerve

Explanation
The long thoracic nerve innervates the serratus anterior muscle. This nerve originates from the brachial plexus and provides motor innervation to the serratus anterior, which is responsible for stabilizing the scapula and assisting in movements of the shoulder joint. Damage to the long thoracic nerve can result in winging of the scapula and weakness in shoulder movements.

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12.

The serratus anterior muscle rotates and protracts the scapula
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The serratus anterior muscle is responsible for both rotating and protracting the scapula. Rotation refers to the movement of the scapula away from the midline of the body, while protraction refers to the movement of the scapula forward and around the rib cage. Therefore, the statement that the serratus anterior muscle rotates and protracts the scapula is true.

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13.

The lower part of the serratus anterior muscle is supplied by the lateral thoracic artery
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
It is supplied by the thoracodorsal artery. The upper part is supplied by the lateral thoracic artery

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14.

Contraction of the diaphragm decreases the volume of the thoracic cavity
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Contraction causes the diaphragm to flatten increasing the volume of the thoracic cavity.

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15.

At what vertebral level is the oesophageal opening in the diaphragm?
- A.
  
  T8
- B.
  
  T10
- C.
  
  T12
Correct Answer
B. T10

Explanation
The oesophageal opening in the diaphragm is located at the level of T10. This is the point where the oesophagus passes through the diaphragm to connect the throat to the stomach.

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Current Version
Mar 21, 2023

Quiz Edited by
ProProfs Editorial Team
Jan 08, 2012

Quiz Created by
Clinical_anatomy

Muscles Of The Thorax

What are the nerve root values for the nerve that innervates the clavicular head of the pectoralis major muscle

What are the nerve root values for the nerve that innervates the sternal head of the pectoralis major muscle?

The pectoralis major muscle is innervated by both the medial pectoral nerve and the lateral pectoral nerve

Where does the pectoralis minor muscle insert into?

The blood supply of the pectoralis minor muscle is from the lateral thoracic artery

The pectoralis minor muscle is involved in the protraction of the scapula

The pectoralis minor muscle is innervated by the lateral pectoral nerve

The innermost intercostal muscles act with the internal intercostal muscles

In what direction to the fibres of the external intercostal muscles point?

The internal intercostal muscles are active in the process of inspiration

Which nerve innervates the serratus anterior muscle?

The serratus anterior muscle rotates and protracts the scapula

The lower part of the serratus anterior muscle is supplied by the lateral thoracic artery

Contraction of the diaphragm decreases the volume of the thoracic cavity

At what vertebral level is the oesophageal opening in the diaphragm?