Dermatomes, Myotomes, Nerve Roots Flashcards Preview

Neuro 1 > Dermatomes, Myotomes, Nerve Roots > Flashcards

Flashcards in Dermatomes, Myotomes, Nerve Roots Deck (16):
1

C2

Back of head

2

C5

Shoulder, lateral arm

3

C6

Lateral forearm and digits 1-2

4

C7

Digit 3

5

T10

Umbilicus

6

L4

Knee and medial lower leg

7

L5

Dorsal foot
Big toe

8

S1

Lateral food, small toe, and sole

9

Dermatome definition

Spiral nerves innervate the skin in an orderly, rostral-caudal arrangement

Touch skin to test spinal nerve and cord segment

10

Myotome

Muscles innervated by spinal nerves

Tested with muscle strength test

11

Effect of L4 Nerve Root Lesion

Reduced patellar tendon reflex
Weakness in iliopsoas, quads
Sensory loss in

12

L5 Nerve Root Lesion

Sensory loss in dorsal of big toe
Weakness in foot dorsifexion, big toe extension, foot eversion, inversion

13

S1 Nerve Root Lesion

Weakness in foot plantar flexion
Decreased Achilles' tendon reflex
Sensory abnormality in lateral foot, small toe

14

C5 Nerve Root Lesion

Weakness in deltoid, infraspinatus, biceps
Reflex decreased in biceps and pectoralis
Sensory abnormality in shoulder, upper lateral arm

15

C6 Nerve Root Lesion

Weakness in wrist extensors, biceps
Reflex decreased in biceps and brachioradialis
Sensory symptoms in first and second fingers, lateral forearm

16

C7 Nerve Root Lesion

Weakness in triceps
Reflex decreased in triceps
Sensory abnormality in middle finger