Chapter 13: Parts of spinal Vertebra

Question 1

Roots

Answer 1

each spinal nerve originates from 2 roots that connect each spinal nerve to a segment in the spinal cord

Question 2

each nerve exits the spinal canal through an opening called the

Answer 2

IVf

formed by superior and inferior borders of adjacent vertebrae

Question 3

posterior or dorsal root contains?

Answer 3

contains

Question 4

posterior root ganglia contains

Answer 4

cell bodies of sensory neurons

• represent sensory fibers that are the dendrites of sensory neurons cell bodies

Question 5

anterior ventral root contains

Answer 5

motor nerve fibers

• axons of spinal cord motor neurons

Question 6

where are sensory neurons found? motor neurons?

Answer 6

posterior horn

anterior horn

Question 7

roots from the lower lumbar, sacral + coccygeal nerves ______ in line with their corresponding vertebrae and form the ______

Answer 7

aren’t, cauda equina

Question 8

what is a fiber ?

Answer 8

single axon with an endoneurium

Question 9

fascicle

Answer 9

bundle bundle of fibers within a perineurium

Question 10

nerve

Answer 10

bundle of fascicles surrounded by an epineurium

Question 11

spinal nerve axons are grouped within?

Answer 11

CT sheaths

Question 12

damage of a compression of spinal nerve roots symptoms?

Answer 12

pain, muscle weakness, loss of feeling (paristesia)

Question 13

anterior median fissure and posterior median sulcus penetrates?

Answer 13

white matter of the spinal cord and divide into right and left halves

Question 14

sulcus

Answer 14

shallow fissure

Question 15

gray matter

shape

what does it contain

Answer 15

• shaped like H
• contains cell bodies of neurons, neuroglia, unmyelinated axons and dendrites of interneurons and motor neurons

Question 16

nucleus

Answer 16

cluster of cell bodies within the gray matter

Question 17

axons in anterior horn will form what?

Answer 17

efferent or motor fibers of spinal nerves

Question 18

gray commissure forms?

Answer 18

cross bar of the letter H

• contains unmyelinated axons that cross from one side to the other

Question 19

central canal

Answer 19

hollow tube that runs the length of the cord

• contains CSF

Question 20

posterior or dorsal horns contain?

Answer 20

cell bodies of sensory neurons

Question 21

anterior or ventral horns contain?

Answer 21

cell bodies of motor neurons

Question 22

lateral horns contain

Answer 22

cell bodies of autonomic motor neurons

• only in thoracic, upper lumbar and sacral segments of spinal cord

Question 23

white matter

divided into ____ pairs of _______?

Answer 23

surrounds the gray matter and is divided into 3 pairs of columns or funiculi

Question 24

columns or funiculi

Answer 24

distinct bundles of myelinated nerve axons that run the length of the cord

• have a common origin or destination and carry similar info
• regulates smooth and cardiac muscles and glands

Question 25

tracts/fasciculi

Answer 25

each column is further subdivided into tracts or fasciculi

Question 26

ascending tracts

Answer 26

conduct sensory nerve impulses (up), only carry sensory info

Question 27

tracts

Answer 27

bundle of nerve fibers * have a common destination/origin * all run within the CNS

Question 28

descending tracts conduct

Answer 28

motor nerve impulses (down)

Question 29

anterior white commissure

Answer 29

connects the white matter of the right and left sides of the spinal cord