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Muscle attachments
| Question | Answer |
|---|---|
| Origin | stationary, immovable attachment of muscle to bone |
| Insertion | movable attachment of muscle to bone |
| Abduction | limb away from median plane |
| Adduction | Limb toward median plane |
| Flexion | decreace joint angle, brings bones closer |
| Extension | increase joint angle, bones farther apart |
| Rotation | Circle |
| Circumduction | Cone |
| Skeletal Muscle | 1. Striated or voluntary 2. Conprises the bulk of the body's muscles 3. attached to skeleton or associated connective tissue |
| Cells of Skeletal muscle | 1. relatively large 2. multi-nucleited 3. long & cylindrical 4. Sarcolemma 5. Sarcoplasm 6. Also called fibers 7. Ranges from 10 microm- 6cm |
| Sarcomere | 1. contractile unit 2. goes form one Z line to the next 3. Actin 4. Myosin |
| Actin | thin filamentboth light & dark |
| Myosin | thick proteinonly in the dark band |
| Endomysium | encloses muscle fibers delicate, areolar connective tissue sheath |
| Perimysium | a collagenic membrane sheaths muscle fibers forming a bundle of fibers called fascicle |
| Epimysium | sheaths the entire muscle large number of fascicles are bound togethervery coarse |
| Tendons | tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tesion |
| Aponeurosis | 1. sheetlike tendinous expansion, serving to connect a muscle with the parts it moves 2. attach muscles to each other or indirectly to bones |
| Motor unit | a neuron and all the muscle cells it stimulates |
| Synaptic cleft | a small fluid-filled gap that separates the neuron and muscle fiber membranes |
| Acetylcholine (ACh) | neurotransmitter chemicleallows change in the permeability of the sarcolemma |
| Vesicles | store various neurotransmitters |
| Agonists | prime moversresponsible for producing a particular movement |
| Antagonists | oppose or reverse a movement |
| Synergists | aid the action of agonists |
| Fixators | specialized synergists |
| Retus | Direction of fibers |
| Maximus | Size |
| Frontalis | Location |
| Biceps | number of origins |
| Sternocleidomastoid | location of origin and insertion |
| Trapezius | shape |
| Adductor | Action |
Created by:
Cediana Studying
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