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21 Cards in this Set
- Front
- Back
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Motor unit
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the alpha motor neuron in the anterior (ventral) horn of the spinal column, its axon, and all the muscle fibers it innervates.
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______ of a muscle is the result of many motor units firing asynchronously & repeatedly.
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contraction
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The ________ of contraction is dependant on the number of motor units firing.
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magnitude
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FASCIA
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sheath of connective tissue
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Superficial fascia
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directly under skin, allows skin to move
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Deep Fascia
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attached to muscles, bones & other connective tissues; form tracts, bands & retinacula. (knee, wrist, ITB, etc.)
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Fascia planes
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interconnected throughout the body
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MUSCLE TENSION
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MUSCLE TENSION
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Passive
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noncontractile; created by lengthening the muscle beyond the slack length.
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Active muscle tension
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Contractile: created by cross-bridge formation
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Total muscle tension
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combo of passive and active tension developed during active contraction
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Agonist is.
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prime mover, produces desired amount
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Antagonist
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muscle direct opposite, do not resist the desired motion but have potnetial to
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synergist
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assists agonist
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shortened muscles are
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hyperactive & tight usually to overuse
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Long muscles are
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inhibited and lengthened: often antagonist of a tight muscle
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Connective tissue damage is
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any process or event that disturbs the normal function of a specific joint structure, including muscle
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Disease
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effects the normal biological fxn of tissues
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injury/trauma
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damages the physical structure leading to weakening and possible instability and failure
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Immobilization is especially detrimental to joint structures and fxn and may result in
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1.joint capsules- shorten
2.ligaments and tendons- lose collagen/cross linking/and strength 3.articular surfaces- develop fibrofatty tissue |
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Mechanism
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joint structures are thouhgt to fail due to lack of adequate recovery time between loads,
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