Spinal cord

Question 0

What is special about CN1?

Answer 0

it only carries sensory nerves

Question 1

How many spinal nerve pairs are in a human?

Answer 1

31

Question 2

How the spinal cord divided?

Answer 2

Cervical nerves: C1-C8
Thoracic nerves: T1-T12
Lumbar nerves: L1-L5
Sacral nerves: S1-S5
Coccygeal nerves: 1 pair

Question 3

How many enlargements are there along the spinal cord?

Where do they occur?

Answer 3

2 enlargements, occurs where limbs attach
Cervical enlargement: C4-T1
Lumbar enlargement: T11-S1

Question 4

What are the names of the nerve plexuses?

Answer 4

Cervical
Brachial
Lumbar
Sacral

Question 5

What nerves make up the cervical plexus?

Important features?

Answer 5

C1-C5

• Ansa Cervicalis has an inferior and superior division that make up a loop
• Phrenic nerve: C 3,4,5 keep the diaphragm alive

Question 6

What nerves make up the Brachial plexus?

Important features?

Answer 6

C5-T1

Best named and divided plexus, easy to see the roots, trunks, divisions, cords, and branches of nerves

Question 7

What nerves make up the Lumbar plexus?

Important features?

Answer 7

L1-L4

innervates the thigh and leg with help of the sacral plexus, linked by L5

Question 8

What nerves make up the Sacra plexus?

Important features?

Answer 8

L4-S5

• Sciatic nerve- largest nerve in body, splits at popliteal region to innervate posterior (tibial division) /anterior (common fibular) leg
• Works with lumbar plexus to innervate thigh and legs, linked through L5