IOTA 5

Question 1

What are the sections of the spinal cord?

Answer 1

5 sections:

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

Question 2

How many are the pairs of spinal nerves ?

Answer 2

31 pairs of spinal nerves

Question 3

How do spinal nerves innervate?

Answer 3

IPSILATERAL part of the body: if you have a C7 on the right it will innervate the right arm(specifically hand)

IPSI: right goes with right

Question 4

What is C1? Location?

Answer 4

It’s only motor
Only spinal cord nerve that has no sensory input

Location: in the skull , where nerves exit

Question 5

Where do cervical nerves (C1-C8) exit from?

Answer 5

Th cervical nerves always exit above the bone at C1

Question 6

Is there a bone at C8?

Answer 6

No

Question 7

Bones of the spinal cord keep growing beyond the spinal cord nerves sections

True or false

What does that mean ?

Answer 7

True

Spinal cord L1- L5 is right next to T11-T12 bones
Spinal cord S1-S5 is right next to L1-L2
So nerves have to travel down to innervate their corrispondent sections

Question 8

What is the Conus medullaris?

Answer 8

The end of the spinal cord: end of CNS

At the end of L2 bone (NOT SPINAL CORD)

Question 9

What is the Cauda equina?

Answer 9

Spinal nerves of the peripheral nervous system from L2-L5

Question 10

What happens when spinal nerves leave through vertebral bones?

Answer 10

They can fuse and intermingle to form plexuses

Question 11

What are mixed nerves?

Answer 11

Sensory & motor nerves

Question 12

What is the Cervical enlargement ?

Answer 12

Side of spinal cord is larger here : C5-T1

This is because you need more nerves to innervate the upper limbs

Question 13

What is the Lumbosacral enlargement?

Answer 13

Between L1-S3

Need more neurons for innervation of lower limbs