Myotome:

· A group of muscles supplied by a single nerve root

· In anatomy,the Myotome is the motor equivalent of a dermatome

· Myotomes are separated by myosepta/myocomma i-e the septum between the adjacent myotomes

Clinical significance:

· Gives information about the level in the spine where a lesion may be present

· Muscle weakness

· IV disc herination

List of myotomes:

Myotomes of upper and lower extremity are as follows:

C1, C2: Cervical flexion

C3: Cervical lateral flexion

C4: Shoulder elevation

C5: Shoulder abduction

C6: Elbow flexion and wrist extension

C7: Elbow extension and wrist flexion

C8: Thumb extension

T1: Finger abduction

L1, L2: Hip flexion

L3: Knee extension

L4: Ankle dorsiflexion

L5: Big toe extension

S1: Ankle planterfleion/eversion/ hip extension

S2: Knee flexion

S3-S4: Anal wink/perineal reflex or anocutaneous reflex

So it is some important notes about myotome

Any question you can freely ask in comments

Thanks