Spinal Nerves

Question 1

How many pairs of nerves are there in the spine?

Answer 1

31 pairs- thousands of nerve fibers

Question 2

What does the spinal nerves connect to?

Answer 2

Spinal cord

Question 3

How many pairs of cervical nerves are in the spinal cord?

Answer 3

8 pairs C1-C8

Question 4

How many pairs of thoracic nerves are in the spinal cord?

Answer 4

12 pairs T1-T12

Question 5

How many pairs of lumbar nerves are there in the spinal cord?

Answer 5

5 pairs L1-L5

Question 6

How many pairs of sacral nerves are there in the spinal cord?

Answer 6

5 pairs S1-S5

Question 7

How many pairs of coccygeal nerves are there in the spinal cord in the spinal cord?

Answer 7

1 pair Co1

Question 8

Why are there 8 pairs of cervical nerves and only 7 pairs of vertebra nerves?

Answer 8

Has 1 extra pair due to the 1st spinal cord comes out before the vertebra connects

Question 9

Order of the nerves from top of spine to bottom

Answer 9

Cervical, thoracic, lumbar, sacral, coccygeal

Question 10

What is the nerve plexus?

Answer 10

A network of nerves

Question 11

What is the brachial plexus?

Answer 11

Formed by ventral rami of C5-C8 give rise to cords and T1

Question 11

What form nerve plexuses?

Answer 11

Cervical, brachial, lumbar, sacral

Question 12

What is the cervical plexus?

Answer 12

Formed by ventral rami of first four cervical nerves (C1-C4)

Question 13

Important nerves that arise from the brachial plexuses are

Answer 13

Axillary, musculocutaneous, radial, median, ulnar nerves

Question 14

What is axillary nerve?

Answer 14

Innervates the
deltoid and teres minor

Question 15

What is musculocutaneous nerve?

Answer 15

Sends fibers to the biceps brachii and brachialis

Question 16

What is median nerve?

Answer 16

Branches to most of the flexor muscles of forearm

Question 17

What is ulnar nerve?

Answer 17

Supplies the flexor
carpi ulnaris and part of the
flexor digitorum profundus

Question 18

What is radial nerve?

Answer 18

Innervates essentially all extensor muscles

Question 19

What is lumbar plexus?

Answer 19

Femoral anterior; arises from L1-L4

Question 20

What is the sacral plexus?

Answer 20

Femoral posterior; arises from L4-S4

Question 21

What is sciatic nerve?

Answer 21

The largest nerve of the sacral plexus is actually two nerves in one sheath

Question 22

What is tibial nerve? (sciatic nerve)

Answer 22

Innervates most of the posterior lower limb

Question 23

What is common fibular? (sciatic nerve)

Answer 23

Innervates muscles of the lower leg

Question 24

The spinal circuits

Answer 24

sensory receptor -> sensory neuron -> interneuron -> Integrating center -> motor neurons -> effector