Muscular System

Structures and description of the muscular system

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Epimysium

Surrounds the skeletal muscle and all fascicles in muscle

Perimysium

Surrounds individual fascicles and seperates muscles into small compartments

Endomysium

Surrounds individual muscle fibers

Sarcolemma

Cell membrane of muscle fiber (cell)

Sarcoplasm

Cytoplasm of muscle fiber (cell)

Myofibril

Threads of protein inside sarcoplasm

Myosin

Thick protein filament in myofibril

Actin

Thin protein filament in myofibril

I Band

Actin filament attached to Z lines

Z Line

Protein which actin binds to

A Band

Region where myosin overlaps actin

Sarcomere

Unit of muscle from Z line to Z line

Motor Neuron

Nerve cell connects to muscle fiber

Neuromuscular Junction

Connection between motor neuron and muscle fiber

Neurotransmitters

Chemicals that go from neuron to muscle fibers

Motor Unit

Consists of a motor neuron and a muscle fiber