9A .2 Flashcards
What are the Connective tissue coverings?
-Fascia
-Tendon
-Aponeurosis
Fascia
Layers of dense connective tissue separating muscles and stabilize their position
*subcutaneous-immediately under the skin
*Deep-lines the body walls and limbs (usually tough)
Tendon
projections of fascia at the ends of a muscle that attach to bone
Aponeurosis
flat, fibrous sheets attaching to other muscles or bone
Epimysium
Sheath covering the whole muscle
Perimysium
-Extends inward from the epimysium and separates muscle tissue into small bundles
Muscle bundles are known as…
Fascicles
Fascicles contain…
10-100+ muscle fibers (muscle cell)
Endomysium
-weaves in between each bundle separating individual muscle fibers
Muscle Fibers
-form from undifferentiated cells that fuse together
-Creates a thin, elongated multinucleated cylinder
-Has a cell membrane and cytoplasm
-lie parallel to each other
-each fiber is stuffed with small parallel fibers called
Order of muscle
Whats Sarcolemma
Cell membrane
Whats Sarcoplasm
cytoplasm
Myofibrils
-Produces the alternating light and dark bands with parts called myofilaments
-Play a fundamental role in contraction mechanisms
-filaments do not extend through the whole fiber
-The striations form a repeating pattern of units called sarcomeres
Actin
thin filaments
