Nervous System

Question 1

Olfactory
Neuron Type: Sensory
Distribution: Neurosensory cells of nasal epithelium.

Answer 1

Cranial Nerve (CN) I

Question 2

Optic
Neuron Type: Sensory
Distribution: Sensory fibers of the retina

Answer 2

Cranial Nerve (CN) II

Question 3

Oculomotor
Neuron Type: Sensory/Motor
Distribution: Innervates dorsal rectus, ventral rectus, medial rectus, and ventral oblique muscles.
Innervates retractor bulbi, levator palpebrae superioris, and intrinsic ciliary muscles.

Answer 3

Cranial Nerve (CN) III

Question 4

Trochlear
Neuron Type: Sensory/Motor
Distribution: Innervates dorsal oblique muscle.

Answer 4

Cranial Nerve (CN) IV

Question 5

Trigeminal
Neuron Type: Sensory/Motor
Distribution: This nerve consists of three branches, all associated with the facial and jaw regions. Ophthalmic branch: innervates the skin in region of eye and nose, upper eyelid, eyeball, and lacrimal glands. Maxillary branch: innervates the palate, upper lip, upper teeth, vibrissae, skin of upper jaw, and vicinity. Mandibular branch: innervates the lower lip, lower teeth, pinna, skin of lower jaw and cheek; muscles; muscles of mastication - masseter, temporal, and pterygoid.

Answer 5

Cranial Nerve (CN) V

Question 6

Abducens
Neuron Type: Sensory/Motor
Distribution: Innervates the lateral rectus.

Answer 6

Cranial Nerve (CN) VI

Question 7

Facial
Neuron Type: Sensory/Motor
Distribution: Innervates facial and digastric muscles; sensory innervation of the tastebuds of anterior two-thirds of tongue; mandibular, sublingual, and lacrimal glands.

Answer 7

Cranial Nerve (CN) VII

Question 8

Vestibulocochlear (Acoustic)
Neuron Type: Sensory
Distribution: Two branches: Vestibular branch innervates organs of equilibrium, saccule, utricle, and semicircular canals. Cochlear branch innervates the acoustic organs, organs of Corti, in cochlea.

Answer 8

Cranial Nerve (CN) VIII

Question 9

Glossopharyngeal
Neuron Type: Sensory/Motor
Distribution: Innervates pharyngeal muscles; sensory innervation of pharynx and tastebuds of posterior one-third of tongue; parotid gland.

Answer 9

Cranial Nerve (CN) IX

Question 10

Vagus
Neuron Type: Sensory/Motor
Distribution: Innervates pharynx, larynx, esophagus, lungs, heart, abdominal viscera.

Answer 10

Cranial Nerve (CN) X

Question 11

Accessory
Neuron Type: Sensory/Motor
Distribution: Innervates the cleidomastoid, sternomastoid, trapezius muscles.

Answer 11

Cranial Nerve (CN) XI

Question 12

Hypoglossal
Neuron Type: Sensory/Motor
Distribution: Innervates the styloglossus, hyoglossus, genioglossus, and intrinsic muscles of the tongue.

Answer 12

Cranial Nerve (CN) XII