Structure and Composition of Muscle

Endomysium

Covers muscle fibers

Perimysium

Covers muscle bundles

Epimysium

Covers the entire muscle

Myotendinal junction

Where muscle fibers, bundles, and muscle and tendons come together

Aponeuroses

Tendinal attachments of muscle

Periosteum

Connective tissue covering bone

Diaphysis

Long, central shaft of bone

Epiphyses

Enlargements on the ends of bones

Epiphyseal plate

Cartilaginous region separating the diaphysis and epiphysis

Supportive connective tissue

Bone and cartilage

Viscous solution containing soluble glycoproteins where the extracellular fibers are embedded

Ground substance

Extracellular fibers

Collagen, elastin, reticulun

Part of the SR that receives the AP and regulates release of calcium

Terminal cisternae

Where motor nerve endings terminate on the sarcolemma

Myoneural junction

Present at myoneural junction that forms a small mound on the surface of the muscle fiber

Motor end plate

Thick filament composed of

Myosin

Thin filament is composed of

Actin, Troponin, and tropomyosin

Red fibers

Smaller diameter, slow twitch, do not tire easily, oxidative metabolism

White fibers

Glycolytic metabolism, larger diameter, fast twitch