The Spinal Cord and Spinal Nerves

Question 1

What are spinal meninges?

Answer 1

connective tissue layers that provide protection and oxygen and nutrients to the spinal cord.

• duramater
• arachnid
• piamater

Question 2

Cerebrospinal Fluid (CSF)

Answer 2

the space between the spinal cord with chemical protection

• provides the spinal cord with chemical protection
• physical protection

Question 3

conus medallaris

Answer 3

• the caudal end of the spinal cord

- causa equina

Question 4

How many parts is the spinal cord divided into?

Answer 4

1) gray matter

2) white matter

Question 5

Gray matter of spinal cord

Answer 5

composed of neuron cell bodies

1) dorsal gray: cell bodies of sensory neurons receive and sum signals from PNS sensory neurons
2) ventral: cell bodies of motor neurons receive and sum signals from PNS sensory neurons

Question 6

White matter of spinal cord

Answer 6

contains ascending and descending fiber pathways

Question 7

Ascending pathways of the spinal cord

Answer 7

relay sensory info from spinal cord to brain

Question 8

descending pathways of the spinal cord

Answer 8

relay motor commands from the brain to the spinal cord

Question 9

Dorsal Root

Answer 9

• cell bodies are in dorsal root ganglion

- carry SENSORY info from PERIPHERAL RECEPTORS to the SPINAL CORD

Question 10

Ventral Root

Answer 10

• cell bodies are in the spinal cord

- carry MOTOR info from the SPINAL CORD to MUSCLES

Question 11

Lesion of spinal nerve

Answer 11

both sensory and motor nerves affected

loss of sensation and muscle paralysis

• diabetes
• alcoholism
• some infections

Question 12

lesion of dorsal root

Answer 12

sensory axons affected

pain tingling or numbness

• injury
• herpes zoster virus

Question 13

Lesion of ventral root

Answer 13

motor axons affected

-muscle paralysis

Question 14

Intercostal nerves

Answer 14

nerves that travel between ribs

Question 15

Spinal Nerve plexus

Answer 15

spinal nerve above and below the ribs from plexuses

Question 16

What things to the intercostal nerves innervate?

Answer 16

muscles of the trunk

and the skin go the trunk

Question 17

what things do the spinal nerves plexuses innervate?

Answer 17

the muscles of the neck and the skin of the neck and limbs

Question 18

musculocutaneous nerve

Answer 18

motor innervation-all muscles of all anterior flexor arm

sensory innervation-skin of anterior forearm

Question 19

Median nerve

Answer 19

motor innervation-most muscles anterior fore arm

sensory- skin of hand

Question 20

ulnar nerve

Answer 20

motor-muscles of hand

sensory-skin of hand

Question 21

radial nerve

Answer 21

motor-all muscles of posterior arm and forearm

sensory- skin of posterior arm, forearm, and hand

Question 22

axillary nerve

Answer 22

motor- muscles of shoulder

sensory- skin of shoulder

Question 23

femoral plexus

Answer 23

lower limbs

Question 24

femoral nerve

Answer 24

motor-muscles of anterior thigh

sensory-skin of anterior thigh

Question 25

sciatic nerve

Answer 25

motor-muscles of posterior thigh all leg foot

sensory- posterior thigh all leg and foot

Question 26

the sciatic nerve turns into which two nerves

Answer 26

tibial and fibular

Question 27

obturator

Answer 27

motor-muscles of medial thigh

sensory-skin of medial thigh