MUSCLES OF MASTICATION

Question 1

Muscles that OPENS THE JAW

Answer 1

LATERAL PTERYGOID

Question 2

Branches of FACIAL NERVE

Answer 2

TRIGEMINAL NERVE:
sensory innervation - mucous membrane anterior 2/3 of tongue, skin of face
motor innervation- muscles of mastication

FACIAL NERVE:
sensory innervation - taste buds anterior 2/3
motor innervation - muscles of facial expression

Question 3

GENICULATE GANGLION gives rise to

Answer 3

GREATER PETROSAL NERVE to STAPEDIUS

CHORDA TYMPANI

POSTERIOR ARTICULAR

PAROTID PLEXUS

Question 4

Terminal branches of FACIAL NERVE from PAROTID PLEXUS

Answer 4

TEMPORAL

ZYGOMATIC

BUCCAL

MANDIBULAR

CERVICAL

Question 5

A tumor of the parotid gland may compress the muscular branches of the facial nerve and cause weakness of the msucles of facial expression on the side of the tumor

Answer 5

PAROTID GLAND TUMOR

Question 6

Paralysis of facial muscles on the affected side

LOSS OF TONUS OF ORBICULARIS OCULI CAUSES EVERTION OF LID - lacrimal fluid is not spread over cornea - vulnerable to ulceration

Drooping of the corner of mouth

Weakened lip muscles affect speech

Paralysis of muscles of facial expression

(-) special sensation on anterior 2/3 of tongue

Dry mouth

No tears

Hyperacussis

Answer 6

BELL’s PALSY

Question 7

Closure of the eyelids in response to blowing on the cornea or touching it with a wisp of cotton

Caused by contraction of ORBICULARIS OCULI MUSCLES

Answer 7

CORNEAL BLINK REFLEX

Efferent limb - FACIAL NERVE

Afferent limb - NASOCILIARY NERVE OF THE OPHTHALMIC DIVISION OF TRIGEMINAL NERVE

Question 8

Wasting and paralysis of muscles of mastication, no common sensaiom on anterior 2/3 of tongue

Answer 8

TRIGEMINAL NERVE INJURY

Question 9

Episodes of sharp, stabbing pain that radiates over the areas innervated by sensory branches of the maxillary or mandibular division of CN V

Triggered by moving the mandible, smiling or yawning, or cutaneous stimulation

May be caused by pressure on or interruption of the blood supply of the trigeminal ganglion

Answer 9

TRIGEMINAL NEURALGIA (TIC DOULOREUX)

Question 10

Mastication

Answer 10

CN V (trigeminal)

Question 11

Facial expression

Answer 11

CN VII (facial)

Question 12

Deglutition

Answer 12

CN IX (glossopharyngeal)

Question 13

Phonation

Answer 13

CN X (vagus)

Question 14

Muscles that CLOSES THE JAW

Answer 14

TEMPORALIS

MASSETER

MEDIAL PTERYGOID