SCID 243 - Quiz 4 - Infratemporal Fossa & Oral Cavity

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  • 1/15 Questions

    The surgical removal of a metastatic tumor in the infratemporal fossa caused an intense hemorrhage. The surgeon clamped the main source of arterial supply to the area, which is the: ______

    • Internal carotid
    • Lingual
    • Maxillary
    • Posterior auricular
    • Superficial temporal
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About This Quiz

SCID 243 - Quiz 4 focuses on the infratemporal fossa and oral cavity, assessing knowledge on anatomical positions, nerve functions, and muscle actions related to dental and cranial health. Essential for medical students and professionals in understanding head and neck anatomy.

Head And Neck Anatomy Quizzes & Trivia

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  • 2. 

    The cell bodies of the postganglionic parasympathetic neurons innervating the sublingual gland are found in which of the following ganglia? 

    • Ciliary

    • Otic

    • Submandibular

    • Superior cervical

    • Trigeminal

    Correct Answer
    A. Submandibular
    Explanation
    The submandibular ganglion contains the cell bodies of the postganglionic parasympathetic neurons that innervate the sublingual and submandibular gland.

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  • 3. 

    The lesser petrosal nerve carries preganglionic parasympathetic fibers to the: _______

    • Geniculate ganglion

    • Otic ganglion

    • Submandibular ganglion

    • Ciliary ganglion

    Correct Answer
    A. Otic ganglion
    Explanation
    The lesser petrosal nerve is a branch of the glossopharyngeal nerve (CN IX). The lesser petrosal nerve carries presynaptic parasympathetic fibers to the otic ganglion. These fibers synapse in the otic ganglion, and the postsynaptic fibers travel on the auriculotemporal nerve to innervate the parotid gland.

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  • 4. 

    Damage of the lingual nerve before it is joined by the chorda tympani in the infratemporal fossa would cause loss of: ________

    • General sensation to the anterior two thirds of the tongue

    • General sensation to the posterior one third of the tongue

    • Secretion of the submandibular gland

    • Taste sensation from the anterior two thirds of the tongue

    • Taste sensation from the posterior one third of the tongue

    Correct Answer
    A. General sensation to the anterior two thirds of the tongue
    Explanation
    The lingual nerve is a branch of V3, the mandibular division of the trigeminal nerve. It transmits general sensation from the anterior 2/3 of the tongue. Damaging this nerve anywhere along its course would cause someone to lose general sensation to the anterior 2/3 of the tongue. The chorda tympani is a branch of VII--it carries taste fibers to the anterior 2/3 of the tongue and presynaptic parasympathetic fibers to the submandibular ganglion.

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  • 5. 

    A 38-year-old patient complained of acute dental pain. The attending dentist found penetrating dental caries (dental decay) affecting one of the mandibular molar teeth. Which nerve would the dentist need to anesthetize to work on that tooth? 

    • Lingual

    • Inferior alveolar

    • Buccal

    • Mental

    • Mylohyoid

    Correct Answer
    A. Inferior alveolar
    Explanation
    The inferior alveolar nerve is a branch of the mandibular division of the trigeminal nerve (V3). It penetrates the mandibular foramen and is the sensory nerve for the mandible and all mandibular teeth. This is the nerve anesthetized by dentists working on the mandibular teeth. It is anesthetized near the mandibular foramen, so sensory nerves from branches distal to that point would be blocked.

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  • 6. 

    The chorda tympani contains which component before it joins the lingual nerve? 

    • Preganglionic sympathetics

    • Postganglionic sympathetics

    • Preganglionic parasympathetics

    • Postganglionic parasympathetics

    • Taste fibers to the posterior third of the tongue

    Correct Answer
    A. Preganglionic parasympathetics
    Explanation
    The chorda tympani contains preganglionic parasympathetic nerves that go to the submandibular ganglion. These preganglionic parasympathetics synapse in the submandibular ganglion and then provide secretomotor innervation to the submandibular and sublingual glands. The chorda tympani also contains taste fibers to the anterior 2/3 of the tongue, but not to the posterior 1/3.

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  • 7. 

    Which of the following suprahyoid muscles would be paralyzed if the inferior alveolar nerve were severed at its origin? 

    • Geniohyoid m.

    • Hyoglossus m.

    • Mylohyoid m.

    • Stylohyoid m.

    Correct Answer
    A. Mylohyoid m.
    Explanation
    Mylohyoid is innervated by the nerve to mylohyoid, which is a branch of the inferior alveolar nerve. The inferior alveolar nerve is a branch of the mandibular division of the trigeminal nerve.

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  • 8. 

    Cutting of the hypoglossal nerve in the hypoglossal canal would not interrupt the nerve supply to the: __________

    • Hyoglossus muscle

    • Genioglossus muscle

    • Palatoglossus muscle

    • Styloglossus muscle

    Correct Answer
    A. Palatoglossus muscle
    Explanation
    All of the tongue muscles are innervated by the hypoglossal nerve. So, hyoglossus, genioglossus, and styloglossus are all innervated by the hypoglossal nerve. Although palatoglossus sounds like a tongue muscle, it is a palatal muscle, innervated by the vagus nerve. (Palatoglossus is the only "glossus" muscle that is not innervated by the hypoglossal nerve.)

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  • 9. 

    A cranial fracture through the foramen ovale that compresses the enclosed nerve, will have an effect on all muscles EXCEPT : ________

    • Tensor tympani

    • Masseter

    • Buccinator

    • Mylohyoid

    • Temporalis

    Correct Answer
    A. Buccinator
    Explanation
    Buccinator is a muscle on the side of the cheek which is innervated by the facial nerve (VII).

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  • 10. 

    A patient who experienced bilateral anterior dislocation of the jaw (temporomandibular joints) could not swallow or talk since the mouth was held open. What is the position of the condyles of the mandible as a result of the dislocation? 

    • Against the external acoustic meatus

    • Against the anterior slope of the articular eminence

    • Against the posterior slope of the articular eminence

    • In the mandibular fossa

    • In the pterygoid fossa

    Correct Answer
    A. Against the anterior slope of the articular eminence
    Explanation
    The TMJ may dislocate anteriorly due to excessive contraction of the lateral pterygoids. This could happen if someone yawned too much or took a large bite of food. So, you want to look for the answer here that represents anterior movement of the jaw. Answer B, against the anterior slope of the articular eminence, is anterior to the normal position of the mandible, so that's the correct answer.

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  • 11. 

    In acute inflammation (arthritis) of the TMJ, the muscle most likely to be affected by the inflammatory process is the: __________

    • Temporal

    • Medial pterygoid

    • Masseter

    • Lateral pterygoid

    Correct Answer
    A. Lateral pterygoid
    Explanation
    The inferior head of the lateral pterygoid inserts into the neck of the mandible, while the superior head of the lateral pterygoid inserts directly into the capsule and articular disk of the temporomandibular joint. So, this muscle would be affected by arthritis of the joint.

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  • 12. 

    The difficulty in swallowing was due to involvement of which muscle that elevates the tongue? 

    • Genioglossus

    • Hyoglossus

    • Styloglossus

    • Stylohyoid

    • Stylopharyngeus

    Correct Answer
    A. Styloglossus
    Explanation
    Styloglossus retracts and elevates the tongue. Genioglossus is a large, fan shaped muscle with many actions: its inferior fibers protrude the tongue, its middle fibers depress the tongue, and its superior fibers draw the tip back and down. Hyoglossus retracts and depresses the tongue. All of these muscles are innervated by the hypoglossal nerve (CN XII).

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  • 13. 

    Paralysis of which of the following muscles would impede retraction of the mandible? 

    • Buccinator

    • Lateral pterygoid, lower portion

    • Lateral pterygoid, upper portion

    • Medial pterygoid

    • Temporalis

    Correct Answer
    A. Temporalis
    Explanation
    Temporalis is the important muscle for retracting the mandible!

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  • 14. 

    The cell bodies of the taste fibers from the anterior two-thirds of the tongue are located in the: _________

    • Geniculate ganglion

    • Otic ganglion

    • Pterygopalatine ganglion

    • Submandibular ganglion

    • Trigeminal ganglion

    Correct Answer
    A. Geniculate ganglion
    Explanation
    The geniculate ganglion is the sensory ganglion of the facial nerve--it holds the cell bodies of the neurons that carry taste sensations from the anterior 2/3 of the tongue. These fibers then travel on the chorda tympani, which carries the fibers to the lingual nerve.

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  • 15. 

    When one presses the tongue tip against the anterior (incisor) teeth, which of the following muscles must contract? 

    • Styloglossus

    • Hyoglossus

    • Genioglossus

    • Superior longitudinal

    • Verticalis

    Correct Answer
    A. Genioglossus
    Explanation
    Genioglossus is a large, fan shaped muscle with many actions: its inferior fibers protrude the tongue, its middle fibers depress the tongue, and its superior fibers draw the tip back and down. So, since the tongue is being protruded, the inferior fibers of genioglossus must be contracting.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 23, 2015
    Quiz Created by
    Permphan
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