Chalter 14 The Soinal Cord

Question 1

Spinal cord

Answer 1

Houses axons and some soma. Runs down the vertebral column.

Question 2

Spinal nerves

Answer 2

Branch out from the spinal cord/ CNS

Question 3

Grey matter in spinal cord

Answer 3

Where neuron cell bodies are. They have little myelin
This is the site of information processing and synaptic integration

Question 4

White matter of the spinal cord

Answer 4

Has abundantly myelineated axons that course up and down the spinal cord
Carries signals from one part of the CNS or another

Question 5

Posterior (dorsal) root of spinal nerve

Answer 5

Carries only sensory fibers

Question 6

Anterior (ventral) root of spinal nerve

Answer 6

Carries only motor fibers

Question 7

Gray commissure

Answer 7

Connects right and left side
It is punctured by a central canal lined with ependymal cells and filled with CSF

Question 8

Lateral horn of gray matter in spinal cord

Answer 8

Visible from T2 through L1
Contains neurons of sympathetic nervous system

Question 9

Columns or funiculi

Answer 9

Three pairs of these white matter bundles

Question 10

Tracts or fasciculi

Answer 10

Subdivisions of each column

Question 11

Ascending tracts

Answer 11

Carry sensory information up the spinal cord

Question 12

Descending tracts

Answer 12

Carry motor information down the spinal cord
All nerve fibers in a given tract have a similar origin, destination, and function

Question 13

Decussation

Answer 13

As the fibers pass up or down the brain stem and spinal cord they cross over from the left to the right side and vise versa

Question 14

Contralateral

Answer 14

When the origin and destination of a tract are on opposite sides of the body

Question 15

Ipsilateral

Answer 15

When the origin and destination of a tract are on the same side of the body
Does not decussate

Question 16

Ganglion

Answer 16

Cluster of neurosomas outside the CNS
Enveloped in an endoneurium continuous with that one nerve
Posterior root ganglion associated with the spinal nerves
Among neurosomas are bound,es of nerve fibers leading into and out of the ganglion

Question 17

Plexus

Answer 17

When a spinal nerve comes down the spinal cord and then meets up and connects with another spinal nerve

Question 18

Brachial plexus

Answer 18

From C5 to T1

Question 19

What is this area of the brachial plexus

Answer 19

The roots of the brachial plexus

Question 20

What is the area of the brachial plexus?

Answer 20

The trunks of the brachial plexus

Question 21

What is this area of the brachial plexus?

Answer 21

The lateral cord of the brachial plexus

Question 22

What is this area of the brachial plexus?

Answer 22

Posterior cord of the brachial plexus

Question 23

What is this area of the brachial plexus?

Answer 23

Medial cord of the brachial plexus

Question 24

What is this nerve in the brachial plexus

Answer 24

Suprascapular nerve

Question 25

What is this nerve in the brachial plexus?

Answer 25

Median nerve
Biggest nerve in brachial plexus

Question 26

What is this nerve in the brachial plexus?

Answer 26

Musculocutaneous nerve

Question 27

What is this nerve in the brachial plexus?

Answer 27

Axillary nerve

Question 28

What is this nerve in the brachial plexus?

Answer 28

Radial nerve

Question 29

What is this nerve in the brachial plexus?

Answer 29

Ulnar nerve

Question 30

Dermatome

Answer 30

A specific area of the skin that receives sensory input from the pair of spinal nerves
They overlap their edges as much as 50%

Question 31

Dermatome map

Answer 31

A diagram of the cutaneous regions innervated by each spinal nerve

Question 32

Referred pain

Answer 32

Pain perceived ata allocation other than the site of the painful stimulus/ origin