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Spinal Nerves Flashcards

1
Q

How many pairs of nerves are there in the spine?

A

31 pairs- thousands of nerve fibers

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2
Q

What does the spinal nerves connect to?

A

Spinal cord

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3
Q

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

A

8 pairs C1-C8

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4
Q

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

A

12 pairs T1-T12

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5
Q

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

A

5 pairs L1-L5

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6
Q

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

A

5 pairs S1-S5

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7
Q

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

A

1 pair Co1

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8
Q

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

A

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

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9
Q

Order of the nerves from top of spine to bottom

A

Cervical, thoracic, lumbar, sacral, coccygeal

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10
Q

What is the nerve plexus?

A

A network of nerves

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11
Q

What is the brachial plexus?

A

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

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11
Q

What form nerve plexuses?

A

Cervical, brachial, lumbar, sacral

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12
Q

What is the cervical plexus?

A

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

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13
Q

Important nerves that arise from the brachial plexuses are

A

Axillary, musculocutaneous, radial, median, ulnar nerves

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14
Q

What is axillary nerve?

A

Innervates the
deltoid and teres minor

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15
Q

What is musculocutaneous nerve?

A

Sends fibers to the biceps brachii and brachialis

16
Q

What is median nerve?

A

Branches to most of the flexor muscles of forearm

17
Q

What is ulnar nerve?

A

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

18
Q

What is radial nerve?

A

Innervates essentially all extensor muscles

19
Q

What is lumbar plexus?

A

Femoral anterior; arises from L1-L4

20
Q

What is the sacral plexus?

A

Femoral posterior; arises from L4-S4

21
Q

What is sciatic nerve?

A

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

22
Q

What is tibial nerve? (sciatic nerve)

A

Innervates most of the posterior lower limb

23
Q

What is common fibular? (sciatic nerve)

A

Innervates muscles of the lower leg

24
Q

The spinal circuits

A

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

Flashcards (48 decks)

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