focusing on just scal muscle now and each of our scal muscles is a separate organ composed of hundreds to thousands of cells called muscle fibers the muscle fibers are organized into facies and groups of facies make up the muscle surrounding the muscle fiber the faasle and the entire muscle are layers of connective tissue and supplying each muscle are also blood vessels and nerves so starting with the gross anatomical structures that make up a muscle and going from smallest to largest and a muscle is made up of myof fibral so myof fibral are cylindrical organel found in muscle cells or muscle fibers composed of overlapping filaments of actin and mein proteins and in the next learning objective we will look at these proteins in more detail a muscle fiber or a muscle cell is a long cylindrical multinucleated cell as we've already discussed and it's made up of many myofibrils bundles of muscle fibers or muscle cells are organized into facies and a sceletal muscle is the entire organ so this entire image here that is made up of several facies and also blood vessels and nerves so we have our individual myof fibral a group of myof fibral makes a muscle fiber or a muscle cell groups of muscle fibers or muscle cells make up facies and several facies bundled together form our entire muscle now moving on to the connective tisue coverings in our muscle and surrounding each muscle fiber or muscle cell is the endom mesum so remember Endo refers to within and my or Mayo refers to muscle surrounding each fascicle which is made up of 10 to 100 or more muscle fibers is our parium again with Perry meaning around so it wraps around our faasle and then the entire muscle which is made up of several facies is the epimysium so Epi again meaning on top so this connective tissue layer sits on top of the entire muscle now each of these connective tissue layers the endium the parium and the epimysium extend beyond the muscle the facies and the muscle fibers to actually form the tendon which attaches the muscle to the Bone the tendon then attaches into the periostium which is the outer layer of connective tissue which surrounds the bone now considering the nerve and the blood supply and generally each sceletal muscle is supplied by one nerve one artery and one one or two veins the neurons that stimulate scallen muscle are called the sematic motor neurons and each motor neuron has one long axon that extends out from the brain stem or the spinal cord and then it branches many times with each branch extending to a different sceletal muscle fiber or a different sceletal muscle cell an artery will run alongside the motor neuron to the muscle then it will also Branch into our microscopic blood vessels that we call capillaries so that each muscle fiber or muscle cell is in close contact with one or more of those capillaries the capillaries will bring the oxygen and the nutrients to the muscle and also remove heat and waste products that are a byproduct of muscle metabolism these waste products and heat will then leave the muscle via one or more ve is