CN (2)

Question 1

General somatic efferent neurons supplies what areas?

Answer 1

motor supply to extraocular muscles (CN III, IV, VI), to sternocleidomastoid and trapezius (CN XI), and all intrinsic and most extrinsic muscles of the tongue (CN XII)

Question 2

General somatic afferent neurons supplies what areas?

Answer 2

sensation from skin of face, mucosae of oral cavity, and meninges of brain

Question 3

General visceral efferent neurons supplies what areas?

Answer 3

PS motor supply to sphincter pupillae (CN III), glands of nasal and oral cavities (CN VII, IX), and viscera of thorax and abdomen (CN X)

Question 4

Special somatic afferent neurons supplies what areas?

Answer 4

signals from visual system (CN II) and from auditory and vestibular system (CN VIII)

Question 5

Special visceral afferent neurons supplies what areas?

Answer 5

signals for special chemical senses of olfaction (CN I) and gustation (CN VII, IX, X)

Question 6

Special visceral efferent neurons supplies what areas?

Answer 6

motor innervation to striated skeletal muscle derived from branchiomeric arches, includes: muscles of mastication (CN V), facial expression (CN VII), and muscles of pharynx, larynx and esophagus (CN IX and X)

Question 7

Olfactory nerves are axons of what kind of cell?

Answer 7

bipolar; mitral cells in bulb

Question 8

Which cells cross at the optic chiasm?

Answer 8

the ganglion cells corresponding to the nasal portion of the retina

Question 9

Where is the lesion if the visual loss results in bitemporal hemianopia?

Answer 9

optic chiasm

Question 10

Where is the lesion if the visual loss results in contralateral homonymous hemianopia?

Answer 10

optic tract, optic radiations, or the upper and lower bank of primary visual cortex

Question 11

Where is the lesion if the visual loss results in contralateral superior quadrantanopia?

Answer 11

lateral optic radiations or lower bank of primary visual cortex

Question 12

Where is the lesion if the visual loss results in contralateral inferior quadrantanopia?

Answer 12

medial optic radiations or upper bank of primary visual cortex

Question 13

Where is the lesion if the visual loss results in monocular visual loss?

Answer 13

optic nerve

Question 14

Where is the lesion if the visual loss results in monocular scrotoma?

Answer 14

retina

Question 15

What is the pathway of the CNIII fibers?

Answer 15

Edinger-Westphal nucleus, out midbrain in interpeduncular fossa, enter lateral wall of cavernous sinus, traverse superior orbital fissure; ps to ciliary ganglion

Question 16

Oculomotor nerve lesion results in what?

Answer 16

pupil deviated down & out, dilated pupil regardless of light level, ptosis of the eyelid, & loss of accommodation.

Question 17

A lesion to CNIV would result in what?

Answer 17

pupil which drifts ups and in, causing diplopia

Question 18

What is the course of the abducens nerve

Answer 18

emerges ventrally btwn the pons & medulla, enters cavernous sinus where it lies against internal carotid, into orbit through superior orbital fissure.

Question 19

A lesion of the abducens nerve results in what?

Answer 19

abducens nerve palsy, medial deviation of the pupil. Turning of the head is an attempt to compensate

Question 20

What is the course of CN V?

Answer 20

exits brain on lateral surface of pons, entering trigeminal ganglion, 3 major branches emerge innervating diff. dermatomes, and exits cranium thru a different site

Question 21

The facial nerve emerges from where?

Answer 21

cerebello-ponto-medullary angle

Question 22

Facial nerve receives input from where? send output to where?

Answer 22

ext. auditory meatus, taste fibers from the anterior 2/3 of the tongue (geniculate ganglion); Autonomic fibers to submandibular, sublingual and lacrimal glands (superior salivatory nucleus) (submandibular or pterygopalatine ganglia)

Question 23

What is the result of facial nerve lesion?

Answer 23

Bell’s Palsy; paresis or paralysis of the face, hyperacusis, loss of tearing, and loss of corneal/blink reflexes

Question 24

What are the components of the cochlear nerve?

Answer 24

composed of central processes of bipolar neurons in spiral ganglia; peripheral processes of neurons extend to spiral organ for hearing

Question 25

What are the components of the glossopharyngeal nerve?

Answer 25

Sensory, Autonomic fibers, Motor-stylopharyngeus m. from nucleus ambiguus

Question 26

What are the components of the vagus nerve?

Answer 26

sensory, taste, visceral afferent, autonomic and motor

Question 27

What is the do the sensory fibers of IX supply? Cell boies are where? Path? Terminate?

Answer 27

taste, pharynx, middle ear, carotid body & sinus, bodies IX ganglia, Central processes enter PL sulcus of medulla terminate descending nuc. of V or solitary nuc

Question 28

Where are the autonomic cell bodies of IX found? synapse?

Answer 28

bodies inferior salivatory nuc., synapse otic ganglion

Question 29

What do the motor fibers of IX supply? Originate?

Answer 29

stylopharyngeus m. from nucleus ambiguus

Question 30

What do the sensory fiber of X supply? Cell bodies?

Answer 30

pharynx, larynx, and tympanic membrane; ganglion on the vagus in the jugular foramen

Question 31

Where are the cell bodies for Taste fibers and visceral afferents of X? Terminate?

Answer 31

from the gut have cell bodies in a ganglion on the vagus and terminate in the solitary nucleus

Question 32

Where to autonomic fibers of vagus to gut originate?

Answer 32

dorsal motor nucleus of the vagus

Question 33

What do the motor of X supply? origin?

Answer 33

muscles of branchial arch origin; nucleus ambiguous

Question 34

What fiber types does CN X contain?

Answer 34

GSA, GVA, SVA, GVE, SVE

Question 35

The spinal accessory nucleus lies where? fibers emerge where and take what course?

Answer 35

intermediate between dorsal and ventral gray horns at cervical levels C1 to C6; laterally, course superiorly thru foramen magnum, exit jugular foramen

Question 36

What is the result of a lesion of CN XI?

Answer 36

head turned ipsilateral side, weakness in shoulder shrugging, inability to elevate arm above horizontal

Question 37

The hypoglossal exits the where and travels what course? supplies what?

Answer 37

anterolateral sulcus of the medulla, traverses the hypoglossal canal; muscles of the tongue

Question 38

What are the symptoms of CN XII lesion?

Answer 38

protruded tongue to deviate ipsilateral side. muscles of tongue will atrophy manifested in a wrinkled