Buck Ch 1 Cranial Nerves

Question 1

Name and Fiber Types:

CN I

Answer 1

Olfactory

SVA
Sensory

Question 2

Name and Fiber Types:

CN II

Answer 2

Optic

SSA
Sensory

Question 3

Name and Fiber Types:

CN III

Answer 3

Oculomotor

GSE, GVE-P
Motor

Question 4

Name and Fiber Types:

CN IV

Answer 4

Trochlear

GSE
Motor

Question 5

Name and Fiber Types:

CN V

Answer 5

Trigeminal

GSA, SVE
Motor and Sensory

Question 6

Name and Fiber Types:

CN VI

Answer 6

Abducens

GSE
Motor

Question 7

Name and Fiber Types:

CN VII

Answer 7

Facial

SVE, GSA, SVA, GVA, GVE-P
Motor and Sensory

Question 8

Name and Fiber Types:

CN VIII

Answer 8

Acoustic

SSA, SSE
Sensory

Question 9

Name and Fiber Types:

CN IX

Answer 9

Glossopharyngeal

SVE, GSA, SVA, GVA, GVE-P
Motor and Sensory

Question 10

Name and Fiber Types:

CN X

Answer 10

Vagus

SVE, GSA, SVA, GVA, GVE-P
Motor and Sensory

Question 11

Name and Fiber Types:

CN XI

Answer 11

Accessory

GSE
Motor

Question 12

Name and Fiber Types:

CN XII

Answer 12

Hypoglossal

GSE
Motor

Question 13

CN containing GSA fibers

Answer 13

V, VII, IX, X

Question 14

CN containing GSE fibers

Answer 14

III, IV, VI, XI, XII

Question 15

CN containing GVA fibers

Answer 15

VII, IX, X

Question 16

CN containing GVE fibers

Answer 16

III, XII, IX, X

Question 17

CN containing SVA fibers

Answer 17

I, VII, IX, X

Question 18

CN containing SVE fibers

Answer 18

V, VII, IX, X

Question 19

CN containing SSA fibers

Answer 19

II, VIII

Question 20

CN containing SSE fibers

Answer 20

VIII

Question 21

Special Somatic Afferent (SSA)

Answer 21

Ear and Eye

hearing, vision, equilibrium

Question 22

Special Visceral Afferent (SVA)

Answer 22

Specialized fibers for Oldfactory (smell) and Gustatory (taste)

Visceral - bc functional association with the digestive tract; activates secretion of digestive juices

Question 23

General Somatic Efferent (GSE)

Answer 23

Fibers carrying motor impulses to skeletal muscle

Paired with GSA fibers

Question 24

General Visceral Efferent (GVE)

Answer 24

Autonomic Fibers innervating smooth muscle of the GUT tube, blood vessels and cardiac muscle and that regulate glandular secretion

Sympathetic and Parasympathetic divisions

Found in spinal nerves and some cranial nerves; includes splanchnics

Paired with GVA

Question 25

Special Visceral Efferent (SVE)

Answer 25

Nerves innervating skeletal muscles derived from the visceral (branchiomeric/pharyngeal) arch of mesoderm which includes muscles of mastication, facial expression, pharynx, palate and larynx. Nothing to do with autonomics (viscera)

Question 26

Special Somatic Efferent (SSE) - not tested by buck

Answer 26

Nerve fibers that allow you to make out/distinguish sounds from noise

Question 27

There are ___ sympathetic ganglia in the head; there are __ sympathetic cranial nerves in the brain.

Answer 27

No, no

Question 28

How do sympathetics enter the brain?

Answer 28

Sympathetic chain and following arteries

Question 29

There are ____ parasympathetic cranial nerves

Answer 29

4 --> CN III, VII, IX, X

Question 30

Function: CN I

Answer 30

SVA Sense of smell; causes reflex salivation and increased gastric motility

Question 31

Function: CN II

Answer 31

SSA Afferent fibers of the retina; primary receptors for sense of sight

Question 32

Function: CN III

Answer 32

GSE = motor component innervating extra-ocular muscles of the eye assisting with rotational movement of the globe GVE-P = parasympathetic innervation of intra-ocular muscles of the eye responsible for changing the shape of the lens for accommodation (focusing on near and far objects) and narrowing of the pupil; done via inferior division of CN III and the ciliary ganglion

Question 33

Function: CN IV

Answer 33

GSE innervation of superior oblique (extra-ocular eye muscle) - moves eye down and out; muscle uses a pulley to carry out its action

Question 34

Function: CN V

Answer 34

GSA = major sensory nerve of the head; innervates portion of the scalp, most of the face, all conjunctiva, epithelium of nasal cavity, paranasal sinuses and oral cavity, skin of the outer ear, external auditory meatus, external surface of the tympanic membrane and cranial dural matter. Also provides proprioceptive fiber to ALL skeletal muscles of the head; V1, V2, V3 SVE = motor innervation to skeletal muscles of the pharyngeal arch origin, specifically the first arch; muscles of mastication, mylohyoid, anterior belly of the digastric m, tensor veli palatini, and tensor tympani muscles; only V3 Carrier of GVE-P fibers for CN III, VII, IX, and distributes these fibers to smooth muscle of the eye (iris and ciliary muscles) and the glands of the head: mucous, salivary and lacrimal

Question 35

Function: CN VI

Answer 35

GSE innervation of lateral rectus (extra ocular eye muscle) - abducts the eyes (hence the name abducens)

Question 36

Function: CN VII

Answer 36

SVE = motor innervation to skeletal muscles of the second pharyngeal arch origin- muscles of facial expression, stylohyloid, posterior belly of the digastric muscle, and stapedius GSA = skin sensory of the external ear and external auditory meatus SVA = taste for the anterior 2/3 of the tongue via chorda typmani GVA = sensory to the uppermost portion of the pharynx GVA-P = parasympathetics to the lacrimal gland, nasal, palatal, oral, and pharyngeal mucous glands via GREATER PETROSAL NERVE and the PTERYGOPALATINE GANGLION; also to the submandibular salivary glands via CHORDA TYMPANI and the SUBMANDIBULAR GANGLION

Question 37

Function: CN VIII

Answer 37

SSA = (1) afferent fibers from organ or corti --> sense of hearing (2) afferent fibers from the semicircular cannals, utricle and saccule of the internal ear --> sense of equilibrium SSE = motor fibers related to modifying auditory input

Question 38

Function: CN IX

Answer 38

SVE = motor innervation to skeletal muscles originating from the third pharyngeal arch- stylopharyngeus GSA = sensory - skin of the external ear SVA = taste - posterior 1/3 of tongue GVA = sensory - epithelium of endodermal origin which lines the majority of the pharynx from the base of the skull to the laryngeal aditus, eustacian tube, middle ear, internal surface of the tympanic membrane, mastoid air cells, tonsils, posterior third of tongue, parotid gland and carotid sinus GVE-P = secretory fibers of the to the parotid salivary glands via the LESSER PETROSAL NERVE and OTIC GANGLION

Question 39

Function: CN X

Answer 39

SVE