nervous system stuff

Question 1

what is the function of afferent fibers?

Answer 1

to convey information from the receptors in the PNS to the CNS

Question 2

what is the function of the efferent fibers?

Answer 2

to convey information from the cns to the effectors in the pns

Question 3

what is the function of the somatic nervous system?

Answer 3

to convey information from the nsa to the skeletal muscles

Question 4

what is the function of the autonomic nervous system?

Answer 4

to convey information from the cns to the smooth muscle, cardiac muscle, and glands

Question 5

what is the functional unit of the nervous system?

Answer 5

the neuron

Question 6

what is a nerve fiber

Answer 6

consists of axon covered by sheath-they may be myelinated or unmylenated

Question 7

what is a nerve?

Answer 7

a bundle of nerve fibers held together by connective tissue and located outside the cns

Question 8

what are the four basic types of nerve fibers?

Answer 8

1. afferent
2. efferent to skeletal muscles
3. autonomic preganglionic efferent
4. autonomic postganlionic efferent

Question 9

what do neurons of the and innervate?

Answer 9

all smooth muscle, all cardiac muscle, all glands

Question 10

name the pairs of cranial nerves

Answer 10

8 cervical
12 thoracic
5 lumbar
5 sacral 
1 coccygeal

Question 11

for the body wall extremities where is the location of the cell bodies of afferent fibers?

Answer 11

dorsal root ganglion

Question 12

for the body wall extremities where is the location of the cell bodies of efferent to skeletal muscle fibers?

Answer 12

ventral grey horn

Question 13

for the body wall extremities where is the location of the cell bodies of preganglionic efferent fibers?

Answer 13

imlcc

Question 14

for the body wall extremities where is the location of the cell bodies of post ganglionic efferent fibers?

Answer 14

sympathetic trunk

Question 15

what are the 3 types of nerves that supply skeletal muscle?

Answer 15

efferent- afferent- postganglionic efferent

Question 16

what nerve fiber types supply skin

Answer 16

afferent and postganglionic efferent

Question 17

how many neurons are in an ans chain?

Answer 17

2

Question 18

what vertebral levels is the imlcc located

Answer 18

t1-l2 (l3)

Question 19

what are the 2 ways a preganglionic neuron can synapse to innervate the body wall?

Answer 19

1. they can synapse in the sympathetic ganglia of the same vertebral level- the postganlionic fibers innervate the effectors
2. the pregangloinic fibers can ascend or descend the sympathetic trunk to reach other levels of the spinal cord

Question 20

how does sympathetic innervation reach the head?

Answer 20

it ascends the sympathetic trunk and then hitch-hikes on arterial supply

Question 21

sympathetic innervation to the head: where do the preganlionic fibers synapse?

Answer 21

in the superior, middle, or inferior ganglia