Anatomy Lab Practical 4

Front 1

Olfactory nerve (fxn)

Back 1

purely sensory - carries afferent impulses associated with sense of smell

Front 2

Optic nerve (fxn)

Back 2

purely sensory - carries afferent impulses associated with vision

Front 3

oculomotor nerve (fxn)

Back 3

primarily motor - somatic motor fibers to inferior oblique and superior, inferior, and medial rectus muscles, which direct eyeball, and to levator palpebrae muscles of the superior eyelid;

parasympathetic fibers to iris and smooth muslce controlling lens shape (reflex responses to varying light intensity and focusing of eye for near vision)

Front 4

trochlear nerve (fxn)

Back 4

primarily motor - provides somatic motor fibers to superior oblique muscle that moves the eyeball

Front 5

trigeminal nerve (fxn)

Back 5

mixed - major sensory nerve of face; conducts sensory impulses from skin of face and anterior scalp, from mucosae of mouth and nose, and from surface of eyes; mandibular division also contains motor fibers that innervate muscles of mastication and muscles of floor of mouth.

Front 6

abducens nerve (fxn)

Back 6

carries somatic motor fibers to lateral rectus muscle that moves the eyeball

Front 7

facial nerve (fxn)

Back 7

mixed - supplies somatic motor fibers to muscles of facial expression and parasympathetic motor fibers to lacrimal and salivary glands;

caries sensory fibers from taste receptors of anterior portion of the tongue

Front 8

vestibulorcochlear nerve (fxn)

Back 8

primarily sensory - vestibular branch transmits impulses associated with sense of equilibrium from vestibular apparatus and semicircular canals; cochlear branch transmits impulses associated with hearing from cochlea.

Front 9

glossopharyngeal nerve (fxn)

Back 9

mixed - somatic motor fibers serve pharyngeal muscles, and parasympathetic motor fibers serve salivary glands;

sensory fibers carry impulses from pharynx, tonsils, posterior tongue (taste buds), and pressure receptors of carotid artery

Front 10

vagus nerve (fxn)

Back 10

mixed - fibers carry somatic motor impulses to pharynx and larynx and sensory fibers from same structures; very large portion is composed of parasympathetic motor fibers , which supply heart and smooth muscles of abdominal visceral organs; transmits sensory impulses from viscera.

Front 11

accessory nerve (fxn)

Back 11

mixed (but primarily motor in function) - provides somatic motor fibers to sternocleidomastoid and trapezius muscles and to muscles of soft palate, pharynx, and larynx (spinal and medullary fibers respectively).

Front 12

hypoglossal nerve (fxn)

Back 12

mixed (but primarily motor in function) - carries somatic motor fibers to muscles of tongue.

Front 13

lateral rectus muscle

Back 13

moves eye laterally

Front 14

medial rectus muscle

Back 14

moves eye medially

Front 15

superior rectus muscle

Back 15

elevates eye and turns it medially

Front 16

inferior rectus muscle

Back 16

depresses eye and turns in medially

Front 17

inferior oblique muscle

Back 17

elevates eye and turns it laterally

Front 18

superior oblique muscle

Back 18

depresses eye and turns it laterally