inside bones for lab

sarcolemma

muscle cell membrane protecting cell

tells muscle to contract

abduction

away from midline

sarcoplasm

cytoplasm of muscle cell

store energy and nutrients

M line

middle of sarcomere

pronation

palms facing back of body 

supination

palms facing front of body

adduction

toward midline of body

triad

2 cisternae and 1 t tubule

sarcoplasmic reticulum

surrounds myofibrils 

stores calcium 

t tubules

electrical current from surface to deep

myofilaments

contracting muscles

actin blue

myosin thick red

myofibrils

myofilaments

thin rod shape

I band 

only actin  A

A band

actin and myosin

H zone

only myosin

cistern

dilated sacs around t tubule

stores calcium

synapse 

junction between axon terminal and muscle join 

axon terminal

end of axon NON swollen end

synaptic cleft

space between knob and motor end plate

axon

carried electrical current signal DOWN to terminal

synaptic knob

swollen end of nerve

neuromuscular junction

communication between nervous and muscle systems

perimysium

fibrous CT surrounds fascicles

fascicle

bundle of muscle fibers (middle)

comes out of muscle

myofibrils

long organelle out of muscle fiber ( smallest)

muscle fiber

myofibrils are inside of muscle fiber 

muscle cell

comes out of fascicle 

epimysium

DICT surrounds entire muscle

endomysium

areolar CT

surrounds each muscle fiber