spinal nerves exam 4 (final exam)

Question 1

what are spinal nerves?

Answer 1

they are nerves that exit spine 31 pairs all the same

Question 2

what is the dorsal and ventral nerve root lets of spine?

Answer 2

tiny nerves that exits dorsal/ventral surface of spinal cord

Question 3

what is the dorsal/ventral nerve roots?

Answer 3

formed by fusion of dorsal/ventral root lets; head toward intervertebral foramen enter dorsal root ganglia

Question 4

what is the swelling in intervertebral foramen?

Answer 4

dorsal root ganglia

Question 5

what exits the dorsal root ganglion then exits vertebral column branches to form:

• dorsal rami
• vertebral rami

Answer 5

spinal nerve

Question 6

what is the somatic nervous system?

Answer 6

takes sense input to CNS takes motor instruction to PNS

Question 7

what is the head?

Answer 7

innervated by cranial nerves (innervation of body)

Question 8

what is innervated in strips by dorsal rami of spinal nerves T2-T12?

Answer 8

back (posterior thorax)(innervation of body)

Question 9

what is innervated by ventral rami which becomes intercoastal nerves (travels in costal groove of ribs)

Answer 9

anterior thorax (innervation of body)

Question 10

what is the lateral cutaneous nerves?

Answer 10

branch from intercostal nerves and go to skin

Question 11

what is the anterior cutaneous nerves?

Answer 11

branches from intercostal nerve goes to skin

Question 12

what are nerve plexuses?

Answer 12

all ventral rami of spinal nerves except T2-T12 enter a nerve plexus, in a plexus nerves fuse, swap nerve fibers then separate, peripheral nerves leave the plexus and go to body regions, each peripheral nerve contains nerve fibers from more than one spinal nerve.

Question 13

where is the cervical plexus located?

Answer 13

it is deep to the sternocleidomastoid

Question 14

what is the cervical plexus formed by?

Answer 14

ventral rami of spinal nerves C1-C4

Question 15

what has important peripheral nerves: many nerves go to thorax including phrenic nerve andinnervates diaphragm?

Answer 15

cervical plexus

Question 16

what is located extending across anterior shoulder and armpit (axil)?

Answer 16

brachial plexus

Question 17

what is the structure of the brachial plexus?

Answer 17

formed form ventral rami of spinal nerves c5-t1

Question 18

where do the peripheral nerves of the brachial plexus go?

Answer 18

most go to muscles and skin of arm and shoulder including: musculocutaneous, axillary, median, ulnar nerve, radial nerve

Question 19

where is the lumbar plexus located?

Answer 19

sits near posterior wall of posterior abdomen

Question 20

what is the structure of the lumbar plexus?

Answer 20

formed from ventral rami of spinal nerves L1-L4

Question 21

what are the peripheral nerves of the lumbar plexus?

Answer 21

most go to skin and muscle or thigh and lower abdomen including: femoral nerve

Question 22

what is located on the floor of the pelvis ?

Answer 22

the sacral plexus

Question 23

what is the structur eof the sacral plexus?

Answer 23

it is formed by ventral rami of spinal nerves L4-S4

Question 24

what are the peripheral nerves of the sacral plexus?

Answer 24

they go to skin and muscles of pelvis, thigh and leg including: sciatic nerve,tibial nerve, common peroneal nerve, superior and inferior gluteal nerves, pudendal nerve,