Why is my (fill in the blank) weak or shaky?

Blame it on the myotomes! The myotomes in your body are special masses of nerve cells receiving messages from the spinal nerve roots. When there's compression on these nerve roots or the spinal cord then these messages may become fuzzy or, in rare cases, non-existent.

Upper Limb

C5- Shoulder Abduction (raising)
C5- Elbow Flexion
C6/7/8- Shoulder Adduction (lowering)
C7- Elbow Extension
C6/7- Wrist Flexion & Extension
C7- Finger Extension
C8- Finger Flexion (this nerve exits between C7 & T1)



Lower Limb

L2- Hip Flexion
L3/4- Knee Extension
L4- Ankle Dorsiflexion (raising foot)
L5- Great toe flexor
L5- Hip Extension
S1- Knee Flexion-(sciatic)
S1- Ankle Plantarflexion (pointing toes down)