Skeletal Muscle Tissue

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Skeletal muscle functions
- produce skeletal movement
- maintain posture and body position
- support soft tissue
- guard entrance and exits
- maintain body temperature
Epimysium

surrounds entire gross muscle (outermost covering)
Perimysium
- divides the skeletal muscles into smaller compartments
- each compartment contains a bundle of fibers referred to as a fascicle
- covers muscle fascicles
Endomysium
- thin sheet of connective tissue that surrounds each individual muscle fiber.
- Lies just over the cell membrane (NOT the cell membrane or sarcolemma)
- covers muscle fibers
Tendon

connective tissue that connects muscle to bone
Ligament

connective tissue that connects bone to bone
Muscle fiber
- muscle cell which is usually spindle shaped and multinucleated
- surrounded by endomysium
Sarcolemma

plasma membrane of a muscle fiber
Sarcoplasm

cytoplasm of muscle fiber (fluid floating around in fiber)
Transverse (T) tubules
- deep invaginations of sarcolemma into the sarcoplasm
- stuff outside can go in
Myofibril

next level down from (pulling things out of) muscle fiber
Myofilament
- smallest unit
- made of thick and thin myofilaments
Thick myofilament

chiefly composed of the protein myosin
Thin myofilament

chiefly composed of the protein actin
Sarcoplasmic reticulum
- internal membrane complex
- sealed organelle
- reservoir for calcium ions
Terminal cisternae
- either side of T tubule running perpendicular to muscle fiber's length
- reservoirs for calcium ions
Sarcomere

functional contractile unit of muscle (unit of contraction)

Author

trsmartblonde

109306

Card Set

Skeletal Muscle Tissue

Description

Functions of muscles and organization of connective tissue in muscles

Updated

2011-10-16T15:57:06Z

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