spinal cord and spinal nerves

Question 1

anatomy of spinal cord

Answer 1

The spinal cord is a cylindrical structure of nervous tissue composed of white and gray matter, is uniformly organized and is divided into four regions: cervical (C), thoracic (T), lumbar (L) and sacral (Ss) each of which is comprised of several segments.

Question 2

length of spinal cord

Answer 2

extends from medulla oblongata to second lumbar vertebrae

Question 3

protective structures of the Spinal cord

Answer 3

vertebral column

meninges

Question 4

meninges

Answer 4

enclose spinal cord and brain

so not cover spinal nerves

Question 5

where are the two enlarged areas of the spinal cord

Answer 5

cervical and lumbar enlargement

Question 6

internal anatomy of the spinal cord

Answer 6

white and grey matter

central canal with CSF

Question 7

grey mater

Answer 7

dendrites
cell bodies
un myelinated axons

Question 8

white matter

Answer 8

outer layer of spinal cords

myelinated axons

Question 9

name and describe the two divisions of the grey matter

Answer 9

posterior (dorsal) grey horn
anterior (ventral)grey horn
lateral horns

Question 10

posterior (dorsal) grey horn

Answer 10

contains cell bodies and axons of interneurons

axons of sensory neurons

Question 11

anterior (ventral) grey horn

Answer 11

contains cells bodies of motor neurons

nerve

Question 12

laterals grey horn

Answer 12

only in enlargements

cell bodies of autonomic neurons

Question 13

regions of white matter

Answer 13

anterior, posterior 2 x lateral column

Question 14

each column contains

Answer 14

a bundle of axons with a common origin or destination and carry similar information

Question 15

tracts

Answer 15

a bundle of axons in CNS

Question 16

tracts carrying nerve impulses to an effector

Answer 16

motor or descending tracts

Question 17

tracts carrying nerve impulses from a receptor

Answer 17

sensory or ascending tracts

Question 18

anatomy of a spina nerve

Answer 18

nerves that enter or exit spinal cords
connect sensory receptors to CNS
31 pairs
named and numbered according to vertebral column

Question 19

spinal nerves entering ans exiting spinal cord

Answer 19

posterior root

anterior root

Question 20

posterior root

Answer 20

thicker, contains ganglion

carries sensory info to SS

Question 21

anterior root

Answer 21

thinner

carries motor info to effector

Question 22

all spinal cords are classified as

Answer 22

mixed nerves