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Neuroscience II > CN VII-IX > Flashcards

CN VII-IX Flashcards

1
Q

Name CN VII

A

Facial

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2
Q

Origins and levels of CN VII facial (3)

A
  1. Facial nucleus (motor) at lower pons at the level of the facial colliculus
  2. Nucleus of solitary tract (taste and parasympathetic)
  3. Superior salivatory nucleus (parasympathetic)
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3
Q

CN VII facial

Preganglionic parasympathetic fibers from the facial nuclei, as well as central axons of the geniculate ganglion carrying… form the…

A

…carrying taste from anterior 2/3 of tongue form the sensory root to the nerve called nervous intermedius

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4
Q

Where does CN VII facial exit?

A

Cerebellopontine angle

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5
Q

What are the peripheral branches of CN VII facial?

A

temporal, zygomatic, buccal, marginal mandibular, cervical

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6
Q

Motor function of CN VII facial

A

Motor to the muscles of facial expression, the auricular muscles, the stapedius, the posterior belly of the digastric, and stylohyoid muscles

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7
Q

Taste functions of CN VII facial

A

Taste from anterior 2/3 of tongue via chorda tympani (peripheral axons of geniculate ganglion) which joins the lingual nerve (V3)

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8
Q

Parasympathetic function of CN VII facial

A

Parasympathetic to the lacrimal, and serous and mucous glands of the nasopharynx, and the submandibular and sublingual salivary glands (also via the chorda tympani)

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9
Q

CN VII facial

Preganglionic parasympathetic fibers from the nervous intermedius form the…

A

greater petrosal nerve

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10
Q

CN VII facial

The greater petrosal nerve is joined by sympathetic fibers from the deep petrosal nerve. This forms the… which synapses in…

A

This forms the nerve to the pterygoid canal (vidian nerve) which synapses in the pterygopalatine ganglion

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11
Q

CN VII facial

Pterygopalatine ganglion sends postganglionic fibers to the… from there to the… and ultimately to the…

A

Pterygopalatine ganglion sends postganglionic fibers to the maxillary nerve from there to the zygomaticotemporal nerve (V2) and ultimately to the lacrimal nerve (V1) supplying the lacrimal gland.

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12
Q

CN VII facial

The pterygopalatine ganglion also sends postganglionic fibers via the palatine nerves to the…

A

serous and mucous glands of the soft and hard palates and the nasopharynx

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13
Q

CN VII facial

Preganglionic parasympathetic fibers (to salivary glands) from the nervous intermedius travel with the facial nerve through the… where they join the…

A

… through the internal acoustic meatus where they join the chorda tympani

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14
Q

CN VII facial

Chorda tympani exits the ear cavity through where?

A

Petrotympanic fissure

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15
Q

CN VII facial

What nerve does chorda tympani join with to supply the submandibular ganglion?

A

Lingual nerve (V3)

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16
Q

CN VII facial

Postganglionic fibers from the submandibular ganglion supply what?

A

Submandibular and sublingual salivary glands

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17
Q

CN VII facial

Taste fibers from anterior 2/3 of tongue join the… and follow back to…

A

…join the chorda tympani in the mouth and follow back to their cell bodies (geniculate ganglion)

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18
Q

CN VII facial

Central axons from the geniculate ganglion join the… on their way to synapse with the…

A

… join the nervous intermedius on their way to synapse with the solitary nucleus

19
Q

CN VII facial exam

A

Facial expression movements and taste

20
Q

CN VII facial lesion

A

Bell’s palsy LMN type of facial paralysis
UMN type of facial paralysis involves contralateral lower half of face

21
Q

Describe Bell’s palsy

A

A result of CN VII facial lesion
hyperacousis, unilateral facial paralysis with inability to wrinkle forehead, raise brow, shut eye, smile; tear flow over sagging lower eyelid, and loss of taste from anterior 2/3 of tongue

22
Q

Where does CN VII facial enter and exit the skull?

A

Enters internal acoustic meatus and exits the skull via stylomastoid foramen

23
Q

CN VIII name

A

Vestibulocochlear

24
Q

CN VIII vestibulocochlear origins and levels (2)

A

Vestibular nuclei at lateral aspect of 4th ventricle
Cochlear nuclei at acoustic tubercle

25
Q

Where does CN VIII vestibulocochlear exit?

A

Cerebellopontine angle

26
Q

CN VIII vestibulocochlear vestibular nuclei function and cochlear nuclei function

A

Vestibular nuclei function: balance and equilibrium
Cochlear nuclei function: hearing

27
Q

Exam for vestibular and cochlear aspects of CN VIII vestibulocochlear

A

Vestibular: caloric test, Barany chair test
Cochlear: Weber and Rinne tests, audiogram

28
Q

CN VIII vestibulocochlear lesion(s)

A

Vestibular: vertigo, nystagmus, dysequilibrium
Cochlear: loss of hearing, tinnitus

29
Q

CN VIII vestibulocochlear reaches the inner ear via the…

A

internal acoustic meatus

30
Q

Name CN IX

A

Glossopharyngeal

31
Q

Origins and levels of CN IX glossopharyngeal (4)

A
  1. nucleus of solitary tract (taste and autonomic) at medulla
  2. nucleus ambiguus (motor) at medulla
  3. inferior salivatory nucleus (parasympathetic) at pons
  4. nucleus of the spinal tract of trigeminal
32
Q

Where does CN IX glossopharyngeal exit?

A

Post olivary sulcus and medulla

33
Q

Motor functions of CN IX glossopharyngeal

A

Motor to stylopheryngeus muscle

34
Q

Taste function of CN IX glossopharyngeal

A

Taste fibers from posterior 1/3 of tongue

35
Q

Sensory function of CN IX glossopharyngeal

A

Sensory to the middle ear, tympanic cavity, eustachian tubes, tonsils, naso-oro-pharynx, uvula, soft palate, and posterior 1/3 of tongue

36
Q

Parasympathetic function of CN IX glossopharyngeal

A

Parasympathetic to the parotid gland via the otic ganglion
Afferent parasympathetic fibers from the carotid sinus/ body

37
Q

Preganglionic parasympathetic fibers from the glossopharyngeal nerve enter the…

A

tympanic nerve

38
Q

CN IX glossopharyngeal

The tympanic nerve enters the tympanic plexus and is joined by sympathetic fibers from the…

A

carotid plexus (superior cervical ganglion)

39
Q

CN IX glossopharyngeal

Sympathetic and parasympathetic fibers form the… which synapses in the…

A

… form the lesser petrosal nerve which synapses in the otic ganglion

40
Q

CN IX glossopharyngeal

Postganglionic fibers from otic ganglion enter the… to supply the…

A

Postganglionic fibers from otic ganglion enter the auriculotemporal nerve (V3) (which wraps around the middle meingeal artery) to supply the parotid salivary gland

41
Q

CN IX glossopharyngeal exam

A

Taste and general sensation of posterior 1/3 of the tongue and oropharynx, sensory part of the gag reflex

42
Q

CN IX glossopharyngeal lesion

A

Aberrations in blood pressure, sometimes pain (glossopharyngeal neuralgia) or loss of sensation in the naso-oro-pharyngeal area, absent gag reflex

43
Q

Where does CN IX exit the skull?

A

Jugular foramen

Neuroscience II (9 decks)

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