MUSCLES OF MASTICATION Flashcards Preview

Anatomy (TOPNOTCH SUPPLEMENT) > MUSCLES OF MASTICATION > Flashcards

Flashcards in MUSCLES OF MASTICATION Deck (14):
1

Muscles that OPENS THE JAW

LATERAL PTERYGOID

2

Branches of FACIAL NERVE

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

3

GENICULATE GANGLION gives rise to

GREATER PETROSAL NERVE to STAPEDIUS

CHORDA TYMPANI

POSTERIOR ARTICULAR

PAROTID PLEXUS

4

Terminal branches of FACIAL NERVE from PAROTID PLEXUS

TEMPORAL

ZYGOMATIC

BUCCAL

MANDIBULAR

CERVICAL

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

PAROTID GLAND TUMOR

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

BELL's PALSY

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

CORNEAL BLINK REFLEX

Efferent limb - FACIAL NERVE

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

8

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

TRIGEMINAL NERVE INJURY

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

TRIGEMINAL NEURALGIA (TIC DOULOREUX)

10

Mastication

CN V (trigeminal)

11

Facial expression

CN VII (facial)

12

Deglutition

CN IX (glossopharyngeal)

13

Phonation

CN X (vagus)

14

Muscles that CLOSES THE JAW

TEMPORALIS

MASSETER

MEDIAL PTERYGOID