Unit 3 Chapter 15 (Peripheral Nervous System)

Question 1

State what the endoneurium, perineurium, and epineurium each enclose

Answer 1

-endoneurium encloses individual axons of a nerve
-perineurium encloses fascicles within a nerve
-epineurium encloses the entire nerve

Question 2

Cranial Nerve I

Answer 2

-I: Olfactory Nerve
-sensory nerve
-smell

Question 3

Cranial Nerve II

Answer 3

-II: Optic Nerve
-sensory nerve
-vision

Question 4

Cranial Nerve III

Answer 4

-III: Oculomotor Nerve
-motor nerve
-4 of the 6 eye muscles

Question 5

Cranial Nerve IV

Answer 5

-IV: Trochlear Nerve
-motor nerve
-operates superior oblique muscle to turn eye laterally and downward

Question 6

Cranial Nerve V

Answer 6

-V: Trigeminal Nerve
-mixed nerve
-chewing, sensations from teeth, parts of scalp and forehead (brain freeze from ice cream)

Question 7

Cranial Nerve VI

Answer 7

-VI: Abducens Nerve
-motor nerve
-operates lateral rectus to abduct the eye

Question 8

Cranial Nerve VII

Answer 8

-VII: Facial Nerve
-mixed nerve
-operates muscle and facial expressions, also involved in taste

Question 9

Cranial Nerve VIII

Answer 9

-VIII: Vestibulocochlear Nerve
-sensory nerve
-sound impulses to the temporal cortex (hearing) and equilibrium sensation to cerebellum (balance)

Question 10

Cranial Nerve IX

Answer 10

-IX: Glossopharyngeal Nerve
-mixed nerve
-taste and sensations in the throat, along with operating large saliva glands and swallowing

Question 11

Cranial Nerve X

Answer 11

-X: Vagus Nerve
-mixed nerve
-controls internal involuntary functions (respiration, heart rate, digestion) and transmits sensory information to those same organs

Question 12

Cranial Nerve XI

Answer 12

-XI: Accessory Nerve
-motor nerve
-motor function to the larynx, soft palate, and muscles that move the head and neck

Question 13

Cranial Nerve XII

Answer 13

-XII: Hypoglossal Nerve
-motor nerve
-voluntary movements of the tongue (chewing and speech)

Question 14

State whether spinal nerves are sensory, motor, or mixed nerves and distinguish among roots, rami, and plexuses

Answer 14

-spinal nerves are mixed nerves
-roots are endings that emerge from a segment of the spinal cord at a specific level
-rami are divided up into 2 portions: anterior rami innervates the skin and muscle on the anterior aspect of the trunk. posterior rami innervates the post-vertebral muscles and the skin of the back.
-plexus are a network of intersecting nerves