Myotomes

Question 1

Myotome

Answer 1

a group of muscles innervated by a single spinal nerve root.

Question 2

ASIA myotome levels

Answer 2

C5- elbow flexion
C6- wrist extension
C7- elbow extension
C8- finger flexion
T1- finger abduction
L2- hip flexion
L3- knee extension
L4- ankle dorsiflexion
L5- Great toe extension
S1- ankle plantarflexion

Question 3

Brachial plexus injury myotome classification

Answer 3

(peripheral nerves outside of SC that are being affected)

*tested with a patient seated for cervical and thoracic myotomes and test the movements which have the strongest association with each myotome

C5- shoulder abduction
C6- elbow flexion and wrist extension
C7- elbow extension
C8-finger flexion
T1- finger abduction
L2- hip flexion
L3- knee extension
L4- ankle dorsiflexion
L5- great toe extension
S1- ankle plantar flexion

Question 4

General myotome classification

Answer 4

C1/2- neck flexion/extension
C3- neck lateral flexion
C4- shoulder elevation
C5- shoulder abduction
C6- elbow flexion/wrist extension
C7- elbow extension/wrist flexion
C8- finger flexion
T1- finger abduction
L2- hip flexion
L3- knee extension
L4- ankle dorsiflexion
L5- Great toe extension
S1- ankle plantar flexion/ankle eversion/hip extension
S2- knee flexion