spinal cord and spinal nerves

Question 1

sensory axons

Answer 1

dorsal root

Question 2

primarily interneurons and sensory neuron axons

Answer 2

posterior horns

Question 3

motor neuron axons

Answer 3

ventral root

Question 4

dorsal median sulcus and ventral median fissure divide cord on either side of canal

Answer 4

central canal

Question 5

cell bodies of somatic motor neurons and some interneurons

Answer 5

anterior horns

Question 6

(thoracic and lumbar only) ANS motor cell bodies

Answer 6

lateral horns

Question 7

located in the center of the spinal cord and shaped like a butterfly or the letter H.

Answer 7

gray matter

Question 8

posterior projections of the gray matter that contain primarily interneurons and the axons of sensory neurons

Answer 8

dorsal horns

Question 9

anterior projections of the gray matter that contain the cell bodies of somatic motor neurons and some interneurons

Answer 9

ventral horns

Question 10

small lateral projections that are present only in the thoracic and lumbar regions of the gray matter. when present, they contain the cell bodies of motor neurons of the autonomic nervous system

Answer 10

lateral horn

Question 11

the cross bar of the H that surrounds the central canal

Answer 11

gray commissure

Question 12

forms the outer region of the spinal cord and is composed of myelinated and nonmyelinated axons organized into tracts

Answer 12

white matter

Question 13

the anterior, more open of the two grooves that partially divide the spinal cord into left and right halves

Answer 13

anterior median fissure

Question 14

the posterior, shallower of the two grooves that partially divide the spinal cord into left and right halves

Answer 14

posterior median sulcus

Question 15

each side of the spinal cord has three funicular, dorsal, lateral, and ventral funiculus, which are further divided into tracts

Answer 15

white columns

Question 16

muscular branches: deltoid and teres minor muscles. cutaneous branches: some skin of the shoulder region

-posterior cord (C5-C6)

Answer 16

axillary

Question 17

muscular branches: flexor muscles in the anterior arm. cutaneous branches: skin on anterolateral forearm

-lateral cord (C5-C7)

Answer 17

musculocutaneous

Question 18

muscular branches to flexor group of anterior forearm; intrinsic muscles of lateral palm and digital branches to the fingers. cutaneous branches: skin of lateral two-thirds of hand on ventral side and dorsum of fingers 2 and 3

-by two branches, one from medial cord (C8, T1), and one from the lateral cord (C5-C7)

Answer 18

median

Question 19

muscular branches: flexor muscles in anterior forearm; most intrinsic muscles of hand. cutaneous branches: skin of the posterolateral surface of entire limb

-posterior cord (C5-C8, T1)

Answer 19

radial

Question 20

rhomboid muscles and levator scapulae

-branches of C5 rami

Answer 20

dorsal scapular

Question 21

serratus anterior muscle
-branches of C5-C7 rami

Answer 21

long thoracic

Question 21

teres major and subscapularis muscles

-posterior cord; branches of C5 and C6 rami

Answer 21

subscapular

Question 22

shoulder joint; supraspinatus and infraspinatus muscles

-upper trunk (C5, C6)

Answer 22

suprascapular

Question 23

pectoralis major and minor muscles

-branches of lateral and medial cords (C5-T1)

Answer 23

pectoral

Question 24

serve the skin and musculature of the posterior body trunk at their approximate level of emergence

Answer 24

dorsal rami

Question 25

bundles of fibers that connect the spinal nerves to the sympathetic chain

Answer 25

rami communications

Question 26

a bundle of nerve fibers that cross the midline of the spinal cord or brain to connect the two hemispheres

Answer 26

white commissure

Question 27

where does the spinal cord end in adults?

Answer 27

in the lower back between the first and second lumbar vertebrae

Question 28

what structure does the spinal cord end in?

Answer 28

conus medullaris

Question 29

what is a plexus

Answer 29

a network of nerves or vessels in the body

Question 30

where are the plexuses located?

Answer 30

cervical, brachial, lumbar, sacral, and coccygeal

Question 31

what are intercostal nerves?

Answer 31

nerves that run between the ribs and are part of the somatic nervous system