anatomy of spinal nerves

Question 1

from medial to lateral describe the arrangement of the spinal nerves

Answer 1

begins with either anterior or posterior horn in the spinal cord

then to either anterior or posterior rootlets which then form a root which then join form the mixed spinal nerve

from the spinal nerve you get a an anterior and posterior ramus branching off

Question 2

anterior -motor or sensory?

Answer 2

motor

Question 3

what does a spinal nerve supply to its area of the body wall?

Answer 3

somatic general sensory
somatic motor
sympathetic motor to organs
reflex functions

Question 4

where would you examine C2 dermatome?

Answer 4

back of scalp and adams apple

Question 5

where would you examine C3 dermatome?

Answer 5

back of neck and jugular notch

Question 6

where would you examine C4?

Answer 6

clavical and shoulder tip

Question 7

where would you examine C5 dermatome?

Answer 7

badge patch on the arm

Question 8

where would you examine C6 dermatome?

Answer 8

thumb

Question 9

where would you examine C7 dermatome?

Answer 9

middle finger

Question 10

where would you examine C8 dermatome?

Answer 10

little finger (pinky)

Question 11

where would you examine T1 dermatome?

Answer 11

medial forearm

Question 12

where would you examine T2 dermatome?

Answer 12

medial arm and sternal angle

Question 13

where would you examine T4 dermatome

Answer 13

male nipple

Question 14

where would you examine T8 dermatome

Answer 14

xiphoid process

Question 15

where would you examine T12 dermatome

Answer 15

pubic symphysis

Question 16

where would you examine L1 dermatome

Answer 16

groin

Question 17

where would you examine L2 dermatome

Answer 17

anterior thigh

Question 18

where would you examine L3 dermatome

Answer 18

anterior knee

Question 19

where would you examine L4 dermatome

Answer 19

medial malleolus

Question 20

where would you examine L5 dermatome

Answer 20

dorsum of foot

Question 21

where would you examine S1 dermatome

Answer 21

heel

Question 22

where would you examine S2 dermatome

Answer 22

posterior knee

Question 23

where would you examine S3 dermatome?

Answer 23

buttock

Question 24

where would you examine S 4 dermatome?

Answer 24

perineum

Question 25

where would you examine S5 dermatome?

Answer 25

perianal skin

Question 26

describe what is happening when a dermatome is tested for sensory function?

Answer 26

stimulation in anterior aspect of right T10 dermatome

AP generated by receptors in that segement

AP travels along axons to anterior ramus

AP travels to T10 spinal nerve

AP travels to T10 posterior root then to posterior rootlets

AP travels to posterior horn of spinal cord

Question 27

what nerve is made up from L2, L3 and L4

Answer 27

femoral nerve

Question 28

what is the other name for the anterior rami of T2-T11

Answer 28

intercostal nerves

Question 29

anterior rami of T12=?

Answer 29

subcostal nerve

Question 30

the area below T12 is supplied by what 2 nerves>

Answer 30

iliohypogastric and ilioinguinal nerves

Question 31

what supplies the skin of the anatomical snuff box?

Answer 31

radial nerve

Question 32

what nerve supplies the skin in the web between big toe and second toe

Answer 32

deep fibular nerve

Question 33

what nerve supplies sensory to the skin on the dorsum of the foot?

Answer 33

superficial fibular nerve

Question 34

what nerve supplies sensory to most of posterior thigh>?

Answer 34

posterior cutaneous nerve of thigh

Question 35

what nerve supplies deltoid and teres minor?

Answer 35

axillary nerve

Question 36

what nerve supplies muscles of anterior arm?

Answer 36

musculocutaneous

Question 37

what muscles supplues anterior forearm, thenar muscles and lumbricals 1+2

Answer 37

median nerve

Question 38

what nerve supplies the muscles of the posterior arm and posterior forearm

all extensors of carpus and digits and abbuctor pollicus longus

Answer 38

radial nerve

Question 39

what nerve supplies some of anterior forearm ( flexor carpis ulnaris and adductor pollicus and medial half od flexor pollicus longus), and hypothenar muscles and lumbrical 3+ 4 and ALL interossei muscles

Answer 39

ulnar nerve

Question 40

what nerve supplies lateral lower leg muscles

Answer 40

superficial fibular nerve

Question 41

what nerve supplies the muscles in anterior lower leg?

Answer 41

deep fibular nerve

Question 42

what nerve supples the quads, sartorius and pectineus

Answer 42

femoral nerve

Question 43

what is happening when a spinal nerve myotome is tested?

Answer 43

AP generated by voluntary intention in primary somatosensory cortex

AP conducted via UMN of axons of corticospinal tract

AP travels to anterior horn of L3 spinal cord

UMN synapses with L3 LMN

AP travels to either L3 postior or anterior ramus

AP via L3 anterior rami often weave through the lumar plexus via named nerve

APs reach neuro motor junction of supplied muscle

Question 44

what does this describe?

Answer 44

patellar tendon gets tapped

stretch applied to quads via quad tendon

quad muscle spindle inititiates AP in anterior rami axons of femoral nerve

AP conducted to dorsal horn of spinal cord

axons then synapse upon LMN that supply quads
AP then reaches NMJ of quads causing them to contracts and bend the knee