Muscular System Notes part 1
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Created by:
adelej on July 23, 2011
Subjects:
anatomy and physiology of small animals
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20 terms
Terms | Definitions |
|---|---|
 aponeuroses | broad sheets of fibrous connective tissue that attach muscles to bones or to other muscles |
| linea alba | most prominent type of aponeuroses |
| origin | muscle attachment site that does not move much when muscle contracts |
| insertion | attachment site that moves a great deal when muscle contracts |
| prime mover | the muscle or muscle group that works directly to produce the desired movement |
| antagonist | muscle or group of muscles that directly oppose the action of the prime mover |
| synergist | muscle that contracts at the same time as the prime mover and helps carry out its job |
| fixator | muscle that stabalizes the joints |
| sarcolemma | cell membrane of skeletal muscle |
| myofibril | fills almost entire volume of cell, contain even smaller protein filaments |
| actin filaments | type of myofibrils that are very thin |
| myosin filaments | type of myofibrils that are very thick |
| A band | arrangement of thick myosin filaments that appear dark |
| I band | arrangement of thin actin filaments that appear light |
| Z lines | dark lines running through the centers of the I bands and serve as sites for attachment of the actin filaments |
| sarcomere | area from on Z line to the next, the basic contracting unit of the skeletal muscle |
| neuromuscular junction | area where nerves join to the muscle |
| acetylcholine | chemical neurotransmitter in the synaptic vesicles |
| acetylcholinesterase | enzyme within the synaptic space that is responsible for breaking down acetylcholine and removing it from the receptors |
| endomysium | thin layer of connective tissue that surrounds all individual skeletal muscle fibers |
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