BIOL 4510 Lecture Notes - Lecture 4: Endoplasmic Reticulum, Micrograph, Muscle Fascicle
Document Summary
Some basic cell biology morphology of muscle cells. Peter backx smooth muscle skeletal, and cardiac is more. Although all 3 are capable of contracting, their morphology is quite different. Skeletal and cardiac muscle are called striated muscle . they have a striated appearance due to the repeat of highly organized structures called sarcomeres along the length of these cells. Sarcomeres are made up of sarcoplasmic reticulum and contractile proteins that are arranged into very organized structures (discussed later) The morphology of skeletal muscle complex than the other 2 muscle types. Skeletal muscle has 3 layers of connective tissue. Outer epimysium (epi on; mys muscle) The collagen fibers of the epimysium, perimysium and endomysium come together at the end of muscle to form the tendon or aponeurosis (broad sheet of tendon). The muscle is divided into bundles (fascicles) which are surrounded by the perimysium. Each muscle fascicle is divided into muscle fibers. Each skeletal muscle contains 100s 1000s of myofibrils.
