E - Myotome

Question 1

Definition of myotome

Answer 1

A group of muscles innervated by a single spinal nerve

Question 2

Structural origin of myotomes

Answer 2

Dermomytome (dorsal portion of somites which develop on day 20 of embryology)

Question 3

Most muscles in the lower and upper limbs receive…

Answer 3

Innervation from more than one spinal nerve, and therefore comprise of multiple myotomes

Question 4

C5 myotome movement

Answer 4

Shoulder abduction

Question 5

C6 myotome movement

Answer 5

Elbow flexion

Question 6

C7 myotome movement

Answer 6

Elbow extension

Question 7

C8 myotome movement

Answer 7

Finger flexion

Question 8

T1 myotome movement

Answer 8

Finger abduction

Question 9

L2 myotome movement

Answer 9

Hip flexion

Question 10

L3 myotome movement

Answer 10

Knee extension

Question 11

L4 myotome movement

Answer 11

Ankle dorsiflexion

Question 12

L5 myotome movement

Answer 12

Great toe extension

Question 13

S1 myotome movement

Answer 13

Ankle plantarflexion

Question 14

The Biceps Brachii muscle is…

Answer 14

Innervated by the musculocutaneous nerve derived from the C5-C7 nerve roots

Question 15

Suspected spinal chord lesions can be tested through the use of…

Answer 15

Myotomes

Question 16

Myotomes are rated…

Answer 16

In terms of power and movement on a scale of 1-5

Question 17

Myotome rating 0

Answer 17

Complete paralysis

Question 18

Myotome rating 1

Answer 18

Visible or palpable contraction

Question 19

Myotome rating 2

Answer 19

Active movement or full ROM with gravity eliminated

Question 20

Myotome rating 3

Answer 20

Active movement, Full ROM against gravity

Question 21

Myotome rating 4

Answer 21

Active movement, full ROM against gravity and moderate resistance against the muscle position

Question 22

Myotome rating 5

Answer 22

Active movement, full ROM against gravity and full resistance in muscle specific position (expected of an unimpaired person)