The PNS

Question 1

The somatic nervous system

Answer 1

connects the CNS with the body’s muscles and skin.

primary function is to control voluntary movements and reflex arcs, while also helping us process the senses of touch, sound, taste, and smell.

Question 2

The PNS detects…

Answer 2

sensory stimuli and delivers info to the CNS

The CNS processes the input and transmits the impulse throw the PNS to muscle and glands

Question 3

Visceral motor division (ANS)

Answer 3

responsible for the maintenence of homeostasis through involuntary motor functions

Question 4

mixed nerves

Answer 4

contain sensory and motor neurons

all 31 pairs of spinal nerves are mixed nerves

Question 5

Axons that connect the PNS with the spinal cords gray matter : anterior root

Answer 5

consists of motor neurons from the anterior horn

Question 6

Axons that connect the PNS with the spinal cords gray matter : posterior root

Answer 6

consists of sensory neurons from the posterior horn

Question 7

Sensory cranial nerves

Answer 7

CN I (olfactory) CNII (optic)
CN VIII (vestibulocochlear nerve)

Question 8

Motor cranial nerves

Answer 8

CN III ( oculomotor) CN IV (trochlear) CN VI (abuducens) , XI (spinal accessory), XII(hypo)

Question 9

mixed nerves

Answer 9

CN V (trigeminal) CNIII (oculomotoe) CN IX (gloss) CN X(vagus)

Question 10

relex arc

Answer 10

The neural “wiring” of a single reflex

the nerve pathway involved in a reflex action, including at its simplest a sensory nerve and a motor nerve with a synapse between.

Question 11

white matter is composed of

Answer 11

myelinated axons

Question 12

gray matter is compose of

Answer 12

unmyelinated axons

Question 13

The subdural space lies between

Answer 13

the dura mater and the arachnoid mater.

Question 14

The specific strip of skin that is innervated by a specific spinal nerve is called a

Answer 14

dermatome

Question 15

Spinal nerves from the sacral region of the cord innervate the ________ muscles.

Answer 15

leg

Question 16

Blood vessels that supply the spinal cord run along the surface of the

Answer 16

pia mater.

Question 17

The tough, fibrous, outermost covering of the spinal cord is the

Answer 17

dura mater

Question 18

If the dorsal root of a spinal nerve is severed,

Answer 18

sensory input would be blocked.

Question 19

The outermost connective-tissue covering of nerves is the

Answer 19

epineurium.

Question 20

Cerebrospinal fluid flows within the

Answer 20

subarachnoid space.

Question 21

The posterior horns of the spinal cord contain mainly

Answer 21

sensory nuclei.

Question 22

Pinky needs to have a tooth in his mandible filled. His dentist injects a local anesthetic to block pain afferents in one of his cranial nerves. What cranial nerve does the dentist numb?

Answer 22

trigeminal

Question 23

Which of the cranial nerves is named for the fact that it “wanders,” that is, innervates structures throughout the thorax and abdomen?

Answer 23

X VAGUS

Question 24

The area of the motor cortex that is devoted to a particular region of the body is proportional to the

Answer 24

The area of the motor cortex that is devoted to a particular region of the body is proportional to the

Question 25

The cerebellum adjusts motor activity in response to all of the following except

Answer 25

touch sensations

Question 26

The area of the primary sensory cortex that is devoted to a particular region of the body is proportional to the

Answer 26

number of sensory receptors in the area of the body.

Question 27

A mechanoreceptor in the papillary layer of the dermis that responds to fine touch is a

Answer 27

tactile (Meissner) corpuscle.

Question 28

In order for a sensation to become a perception,

Answer 28

it must be received by the somatosensory cortex.

Question 29

Gustatory receptors are sensitive to dissolved chemicals but insensitive to light. This is due to

Answer 29

receptor specificity.

Question 30

golgi tendon organs

Answer 30

detect the sensory component of of reflexes that monitor and control movement

Question 31

golgi tendon reflex

Question 32

crossed extension relfex

Answer 32

occurs simultaneously and causes contraction of the extensor muscles of the upper limb

Question 33

sensory receptors: Intereoreceptors

Answer 33

detect stimuli from within the body

Question 34

exteroreceptors

Answer 34

detect stimuli outside the body

Question 35

nocireceptors

Answer 35

detect painful stimuli