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sarcoplasm
cytoplasm of muscle cells
sarcolemma
plasma membrane of muscle cells
sarcoplasmic reticulum
ER organelle of muscle cells
storage sit for calcium
red
myofibrils
muscle cells/fibres contain many fibrils
arranged into units of contraction (sarcomere)
tick myosin filaments
thin actin filaments
tiny dots, with yellow nucleus on periphery
neuromuscular junction
junction between motor neuron and muscle fibre
transverse tubules
extend from sarcolemma to sarcoplasmic reticulum
extensions of plasma membrane
green
skeletal muscle and connective tissue relationship
Endomysium
Surrounds individual muscle fibres
Perimysium
Surrounds bundles of muscle fibres (fascicles)
Epimysium
Surrounds entire muscle
skeletal muscle in tongue
crisscrossed fibres
makes the tongue really strong
transmission electromicrograph of skeletal muscle
dark grey= mitochondria
white = endomysium (loose connective tissue)
striations and sarcomeres