The human body is a complex thing that holds many secrets. Two things you might not know about on the human body are the dermatome and the myatome. Dermatomes are sections of skin innervated by a spinal nerve and myatomes are a muscle innervated by a spinal nerve. This two parts are similar to one another and only differientiate in the fact that one is made of skin and the other is made of muscle.
They both work together with the bones to ensure that we can move about. Even the smallest most inconsequintial of body parts serve a purpose together to make something about the body work properly.