This membrane is called a sarcolemma . Sarco means flesh, and lemma means sheath. Each muscle is made up of a group of muscle fibers held together by connective tissue and surrounded by a fibrous sheath called fascia . Within this fascial sheath are blood vessels and nerves that supply the muscle with necessary oxygen, nutrition and nerve impulses. The triceps brachii muscle is found in the upper arm.
Skeletal muscles shorten and pull on bones to cause movement of body parts.
Each muscle has three major parts. In addition, a muscle has two or more points of attachment to bones. The more fixed point of attachment is called the origin , and the point of attachment to the bone that moves when the muscle contracts is called the insertion. Tendons are fibrous bands of connective tissue that bind muscles to bones at their origin and insertion. Tendons vary in length.