Muscle Tissue

Sarcoplasm

Cytoplasm of a muscle fiber

myfibril

responsible for skeletal muscle fiber contraction

Myosatellite cells

stem celsl that take part in the repair of damaged muscle tissue

Action potentials

Electrical impules conducted by the sarcolemma travel along the t tubules into the cell interior to trigger muscle contraction.

Endomysium

Connective tissue that surrounds the individual skeletal muscle cells called muscle fibers, and loosely interconnects adjacent muscle fibers. - contains capillary networks that supply blood to the muscle fiber myosatellite cells (stem cells), and nerve fibers that control the muscle.

Sarcolemma

Plasma membrane of a muscle fiber

tendon

Point at which the collagen fibers of the epimysium, perimysium, and endomysium come together to form a bundle - usually attach skeletal muscles to bone

aponeurosis

Point at which the collagen fibers of the epimysium, perimysium, and endomysium come together to form a sheet which connects muscles to bone

Epimysium

The dense layer of collagen fibers that surrounds the entire muscle.

Myofilaments

bundles of protein filaments that make up myofibrils.

Perimysium

divides the skeletal muscle into a series of compartments which contain a bundle of muscle fibers - made up of collagen and elastic fibers as well as blood vessels and nerves that serve the muscle fibers within the fascicles.

myoblasts

embronic cells that fuse, forming individual multinucleate skeletal muscle fibers.

Transverse tubules

narrow tubes that are continuous with the sarcolemma and extend depp into the sarcoplasm - filled with extracellular fluid and form passageways through the muscle fiber, like a network of tunnels through a mountain.