Muscle Structures

Thick filament

composed primarily of myosin

sarcoplasmic reticulum

A membrane complex that forms a tubular network around each individual myofibril

H Zone

Contains thick filaments but no thin

I Bands

Light bands

Sarcoplasm

cytoplasm of the muscle fiber

zone of overlap

Thin filaments situated between thick filiments

Z

line

Sarcolemma

Cell membrane of a muscle fiber

Titin

Extend from tip of thick filament to attachment site of z

Myoblast

Group of embryonic cells

terminal cisternae

On either side of the t tubules the tubule of the sarcoplasmic reticulum enlarge and form chambers called this

Epimysium

Surrounds entire muscle

M Line

Central portion of each thick filament

thin filament

Composed primarily of actin

Perimysium

Connective tissue fibers that divide the skeletal muscle into a series of compartments

Fascicle

bundle of fibers

Endomysium

surrounds muscle cells

transverse tubules

Narrow tube that are continuous with sarcolemma into sarcoplasm at a right angle to the cells surface

Myofibrils

Inside muscle fiber branches of t

A bands

Dark Bands

satellite cells

Embryonic stem cells repairing muscle muscle tissue

Tendon

At the end of the muscle, the collagen fibers of the epi, peri, and endo

Triad

Combination for a pair of terminal cisternae an one t tubule

Sarcomeres

from z

Aponeurosis

End of the muscle that forms a broad sheet

Myofilaments

two different types, thick and thin