Cranial Nerves

Question 1

Special Somatic Afferent (SSA)

Answer 1

Vision, Hearing

Question 2

Special Visceral Afferent (SVA)

Answer 2

Smell, Taste

Question 3

General Somatic Afferent (GSA)

Answer 3

Face, Mouth

Question 4

General Visceral Afferent (GVA)

Answer 4

Pharynx, Larynx

Question 5

Somatic Efferent

Answer 5

Skeletal Muscle

Question 6

Visceral Efferent

Answer 6

Parasympathetic?

Question 7

Cranial Nerve I

Name?
Fiber Type?
Innervation?

Answer 7

Olfactory N.
SVA - Cribiform Plate
*cell bodies in olfactory epithelium on ethmoidal labyrinth

Question 8

Cranial Nerve II

Name?
Fiber Type?
Innervation?

Answer 8

Optic Nerve
SSA - Optic Foramen
*cell bodies in the retina

Question 9

Cranial Nerve III

Name?
Fiber Type?
Innervation?

Answer 9

Oculomotor N.
Orbital Fissure
SE - extrinsic eye muscles: Ventral Oblique; Dorsal, Medial, Ventral Rectus
VE - intrinsic eye muscles: ciliary body, iris

Question 10

Cranial Nerve IV

Name?
Fiber Type?
Innervation?

Answer 10

Trochlear N.
Orbital Fissure
SE - one extrinsic muscle
Dorsal Oblique

Question 11

Cranial Nerve V

Name?
Fiber Type?
Innervation?

Answer 11

Trigeminal N.
GSA - sensory to face
SE - muscles of mastication

• Maxillary N. (Round foramen and alar canal)
  both lids laterally; upper jaw, teeth, lips; nose and nasal cavity
• Mandibular N. (Oval Foramen)
  lower jaw, teeth, tongue; temporal region skin; also muscles of mastication
• Opthalmic N. (Orbital Fissure)
  Orbit; cornea; eyelids and skin medial to eye

Question 12

Maxillary N.

Answer 12

Division of Trigeminal N.
(Round foramen and alar canal)
both lids laterally; upper jaw, teeth, lips; nose and nasal cavity

Question 13

Mandibular N.

Answer 13

Division of Trigeminal N.
(Oval Foramen)
lower jaw, teeth, tongue; temporal region skin; also muscles of mastication

Question 14

Opthalmic N.

Answer 14

(Orbital Fissure)

Orbit; cornea; eyelids and skin medial to eye

Question 15

Cranial Nerve VII

Answer 15

Facial Nerve
(Internal Acoustic Meatus –> stylomastoid f.?)
Facial expression, taste, secretions (saliva, lacrimal, nasal)
SE - facial expression muscles (ears, eyes, lids, nose, and lips)
VE - nasal, lacrimal, salivary glands (sublingual and mandibular)
SVA - taste buds of rostral 2/3 of tongue

Question 16

Cranial Nerve VIII

Answer 16

Vestibulocochlear N.
(Internal acoustic meatus)
Hearing, head acceleration (SSA)
In petrous part of temporal bone
hearing: bipolar cell bodies in spiral ganglion of cochlea
acceleration: bipolar cell bodies in vestibular ganglion, associated with vestibular apparatus

Question 17

Cranial Nerve IX

Answer 17

Glossopharyngeal N.
(Jugular Foramen)
Taste, Pharynx/middle ear sensation, saliva
GVA - receptors in pharynx, middle ear, carotid sinus and carotid body
SVA - taste buds at caudal 1/3 of tongue
VE - parotid and zygomatic salivary glands

Question 18

Cranial Nerve X

Answer 18

Vagus N.
(Jugular Foramen)
SE - mm. of larynx, pharynx, esophagus (voice, cough, swallow, regurgitate)
VE - thoracic and abdominal viscera, postgang neurons in terminal ganglion
GVA - receptors in viscera and larynx/pharynx

Question 19

Cranial Nerve XI

Answer 19

Accessory N.
(Jugular foramen)
Neck mm.
SE - trapezius, omotransversarius, cleidocephalicus, sternocephalicus

Question 20

XII

Answer 20

Hypoglossal N.
(Hypoglossal foramen)
Tongue mm.
SE - styloglossus, hyoglossus, genioglossus, intrinsic tongue mm.