Spinal cord

Question 1

3 key functions of the spinal cord

Answer 1

1. CONVEYS SENSORY INFO from the periphery to the brain via ascending (sensory) tracts
2. CONVEYS MOTOR INFO from the brain to the periphery via descending (motor) tracts
3. COORDINATES SOME REFLEXES (others are coordinated by the brain)

Question 2

the spinal cord is very delicate, what protects it?

Answer 2

VERTEBRAL COLUMN

Question 3

3 layers of the spinal meninges

Answer 3

dura mater

arachnoid

pia mater

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Question 4

Dura mater of the spinal meninges

Answer 4

outer layer

an extension of the dura mater around the brain and continues down to the level of the second sacral vertebra

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Question 5

arachnoid mater of the spinal meninges

Answer 5

middle layer

has a small subdural space containing interstitial fluid between it and the outer dura mater

CSF between arachnoid layer and the inner Pia mater in the SUBARACHNOID SPACE

CSF also flows through the CENTRAL CANAL

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Question 6

pia mater of the spinal meninges

Answer 6

inner layer

surrounds the outer surface of the spinal cord

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Question 7

the spinal cord begins as an extension of…..as it passes through the

Answer 7

the MEDULLA OBLONGATA of the brain stem… FORAMEN MAGNUM of the occipital bone

Question 8

the spinal cord ends at…

Answer 8

about the level of the superior boarder of the SECOND LUMBAR VETEBRA

Question 9

two enlargements of the spinal cord

Answer 9

cervical enlargement

lumbar enlargement

Question 10

in a cross section, the spinal cord consists of an outer _____ __ ____ ____ surrounding an inner _____ _____ _ ______ _____ ____

Answer 10

OUTER REGION OF WHITE MATTER

INNER LAYER OF GRAY MATTER

Question 11

the ____ ______ fissure is deeper than the _____ _____ _____

Answer 11

ANTERIOR MEDIAN FISSURE

POSTERIOR MEDIAN SULCUS

Question 12

THE GRAY MATTER of the spinal cord is shaped like

Answer 12

a Butterfly or the letter H

Question 13

ANTERIOR GRAY HORNS contain….

Answer 13

somatic MOTOR nuclei that provide impulses for skeletal muscle contraction

Question 14

POSTERIOR GRAY HORNS contain….

Answer 14

axons of SENSORY neurons whose cell bodies are in posterior root ganglia as well as interneurons

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Question 15

WHITE MATTER, consisting of myelinated axons of neurons, is divided into

Answer 15

regions known as columns

columns in turn consists of bundles of axons known as tracts

Question 16

ASCENDING TRACTS convey

Answer 16

SENSORY impulses from the spinal cord to the brain

Question 17

DESCENDING TRACTS convey

Answer 17

MOTOR impulses from the brain down through the spinal cord

Question 18

ANTERIOR ROOTS and rootlets contain

Answer 18

axons of MOTOR neurons that emerge out of anterior gray horns of the spinal cord

Question 19

POSTERIOR ROOTS contain

Answer 19

SENSORY axons of neurons whose cell bodies are in bulges in the root known as posterior root ganglia