Ch. 14.1- Overview

Question 1

Spinal reflexes

Answer 1

Nervous system responses that do not require the input of the brain.
These are our tastes responses.

Question 2

Where does the spinal cord end?

Answer 2

The superior border of the small of the back.

Question 3

Posterior median sulcus

Answer 3

Narrow groove on the posterior surface of the spinal cord.

Question 4

Anterior median sulcus

Answer 4

Slightly wider groove than the posterior median sulcus that in on the anterior side of the spinal cord.

Question 5

Endoneurium

Answer 5

Electrically insulates each individual axon

Question 6

Perineurium

Answer 6

Encloses each bundle of axons (fascicles)

Question 7

Epineurium

Answer 7

Ensheathes the entire nerve.

Question 8

How many spinal nerves are there?

Answer 8

31

Question 9

How many of each type of nerve are there in the spine?

Answer 9

C 1-8
T 1-12
L 1-5
S 1-5
Coccyx-1

Question 10

What are nerve plexuses?

Answer 10

Extensions of the spinal cord.

Question 11

What are the two roots of each spinal nerve?

What are their roles?

Answer 11

Posterior root- Sensory receptors send signals to the spine through here. Has ganglion.
Anterior root- contains motor neurons that extend to effectors. Usually involved in muscle control. No ganglion present here.

Question 12

Posterior root ganglion

Answer 12

Cell bodies that are gathered in the posterior root and outside the spinal cord.

Question 13

Multipolar neurons

Answer 13

Motor neurons that compose the spinal nerve.

Question 14

Cauda Equina

Answer 14

This is where the spinal nerves stop heading out directly from the spinal cord and instead move inferiorly till they reach the point where the exit the vertebral column. This exists as the spinal cord itself is not as long as the vertebral column.

Question 15

Conus Medullaris

Answer 15

Most superior part of the caudate equine.