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Epimysium
surrounds skeletal muscle and all fascials in a muscle
Perimysium
surrounds individual fascials and separates muscle into small compartments
Endomysium
surrounds individual muscle fibers
Sacrolemma
all membrane of a muscle fiber (cell)
Sacroplasm
Cytoplasm of a muscle fiber (cell)
Myofibril
threads of protein inside the sacroplasm
Myosin
thick protein filament inside a myofibril
Actin
thin protein filament inside a myofibril
I Band
actin filaments attached to Z-Lines
Z Line
protein to which actin binds
A Band
region where myosin overlaps actin
Sacromere
unit of muscle from Z Line to Z Lines
Motor Neuron
nerve cell that connects to muscle fiber
Neuromuscular Junction
connection
Neurotransmitters
chemicals that go from neuron to muscle fibers
Motor Unit
consists of motor neuron and a muscle fiber