Skeletal Muscles

You have more than 430 skeletal muscles.  In the most basic sense, muscles are made up of interconnected layers of fibers and chemicals stimulated and manipulated by electric current.  The controller of the on/off switch is you. Your thoughts and intention cause the muscles to respond.  Muscles are covered with epimysium or fascia and this is the coating you see over the actual muscle tissue. It is smooth and gives the muscles their shape and separation.  The epimysium is continuous with tendons and protects the muscles from frition with other muscles and bones.  Under the epimysium the muscle fibers are grouped in bundles of up to 150 fibers called fasciculi.  Perimysium covers these bundles, endomysium covers the fibers themselves.

So, there are 3 levels or layers of connective tissue within the muscle.  This tissue connects all layers of the inside and outside of the muscle with the tendon.  This means even smallest effort or contraction delivers force to the tendon and causes the resultant movement of the skeleton. The 3 levels or layers are listed again for ease and convenience below:

Epimysium, the fascia that covers the muscles, separates them and makes them smooth and low friction.

Below that, smaller bundles but similar concept we have,

Perimysium, the covering of bundles of muscle fibers (fasciculi)

And beneath that,

Endomysium covering the fibers themselves.