test 2 ch8 cranial nerves

Question 1

• composition: sensory
• function: olfaction

Answer 1

I - olfactory nerve

Question 2

• composition: sensory
• function: vision

Answer 2

II - optic nerve

Question 3

• composition: somatic motor
• function: motor impulses to levator palpebrae superioris and extrinsic eye muscles, except superior oblique and lateral rectus; innervation to muscles that regulate amount of light entering eye and that focus the lens

Answer 3

III - oculomotor

Question 4

• composition: somatic motor
• function: motor impulses to superior oblique muscle of eyeball

Answer 4

IV - trochlear

Question 5

has three divisions:

ophthalmic
- composition: sensory
- function: sensory impulses from cornea, skin of nose, forehead, and scalp

maxillary
- composition: sensory
- function: sensory impulses from nasal mucosa, upper teeth and gums, palate, upper lip, and skin of cheek

mandibular
- composition: sensory -
proprioception: proprioception from muscles of mastication
somatic motor: motor impulses to muscles of mastication and muscle that tenses the tympanic membrane

Answer 5

V - trigeminal

Question 6

• composition: somatic motor
• function: motor impulses to lateral rectus muscle of eyeball

Answer 6

VI - abducens

Question 7

• composition: 1. somatic motor, 2. parasympathetic motor, 3. motor
• function: 1. motor impulses to muscles of facial expression and muscle that tenses the stapes, 2. secretion of tears from lacrimal gland and salivation from sublingual and submandibular salivary glands, 3. sensory impulses from taste buds on anterior two-thirds of tongue; nasal and palatal sensation

Answer 7

VII - facial

Question 8

• composition: sensory
• function: sensory impulses associated with equilibrium and hearing

Answer 8

VIII - vestibulocochlear

Question 9

• composition: 1. somatic motor, 2. sensory, 3. parasympathetic motor
• function: 1. contraction of muscles of pharynx (swallowing) and larynx (phonation), 2. sensory impulses from taste buds on rear of tongue; sensations from auricle of ear; general visceral sensations, 3. regulation of many visceral functions

Answer 9

X - vagus

Question 10

• composition: somatic motor
• function: laryngeal movement; soft palate, motor impulses to trapezius and sternocleidomastoid muscles for movement of head, neck, and shoulders

Answer 10

XI - accessory

Question 11

• composition: somatic motor
• function: motor impulses to intrinsic and extrinsic muscles of tongue and infrahyoid muscles

Answer 11

XII - hypoglossal

Question 12

• composition: 1. somatic motor, 2. sensory, 3. parasympathetic motor
• function: 1. motor impulses to muscles of pharynx for swallowing, 2. sensory impulses from pharynx, middle-ear cavity, carotid sinus, and taste buds on posterior one-third of tongue, 3. salivation from salivary gland

Answer 12

IX - glossopharyngeal