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48 Cards in this Set
- Front
- Back
major type of muscle in the body is |
skeletal muscle |
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main function of skeletal muscle |
to provide movement |
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level of organization for muscle (largest to smallest) |
muscle ---> fibers ---> myofibrils ---> myofilaments |
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types of myofilaments and their function |
actin & myosin..slide past eachother for contraction |
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muscle fiber |
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the sarcomere is |
the contractile unit of the muscle |
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thin filaments are |
actin |
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thick filaments are |
myosin |
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I band has |
only actin |
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A band has |
actin & myosin |
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H zone has only |
myosin |
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Z line has |
bisect I band, compose one sarcomere |
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sarcolemma is |
the covering of each muscle fiber |
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sarcoplasm is |
the cytoplasm of a muscle fiber |
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sarcosome is |
the mitochondria of muscle tissue |
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muscle fiber |
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sarcoplasmic reticulum is |
endoplasmic reticulum of muscle tissue |
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endomysium is |
thin areolar connective tissue surrounding each individual fiber |
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perimysium |
collagenic membrane surrounding bundle of fibers |
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epimysium |
CT around entire muscle |
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deep fascia is |
CT that binds muscles into functional groups |
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tendons connect |
muscle to bone (strong, rope like) |
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aponeuroses conenects |
muscle to muscle or muscle to bone (flat, sheet like) |
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origin is |
fixed attachement of muscle |
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insertion |
moveable attachment of muscle |
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neuromuscular junctions are found where |
between nerve fibers and muscle cells |
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synaptic cleft is |
the gap seperating neuron and muscle fiber |
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Neuromuscular junction |
acetylcholine (ACh) leaves neuron --> goes to synaptic cleft --> and binds receptor on muscle sarcolemma --> ACh is then released --> sarcolemma channels then open --> K+ an Na+ flow across membrane --> ACTION POTENTIAL |
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Agonists |
responsible for producing movement |
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Antagonists |
oppose or reverse a movement, provides resistance |
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synergists |
aid antagonists |
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fixators |
specialized synergists, immobilize and allow you to pose |
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Orbicularis occuli |
origin: frontal & maxillary bones insertion: tissue of eyelid Action: closes eye |
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Orbicularis occuli location |
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Levator labii superioris |
origin:zygomatic bone & infraorbital margin of maxilla insertion: skin & muscle of upper lip Action: opens lip, raises& furrows upper lip |
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Levator labii superioris location |
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zygomaticus |
origin:zygomatic insertion: corners of mouth action: smiling |
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zygomaticus location |
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Risorius |
origin: Fascia of masseter muscle insertion:skin at angle of mouth actiion: draws corner of lip lateral |
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Risorius location |
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Buccinator |
origin: molar region of maxilla&mandible Insertion:orbicularis oris action:draws corners of mouth
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Buccinator location |
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mentalis |
origin: madible below incisors insertion: skin of chin action: protrudes lower lip, wrinkles skin |
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mentalis location |
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masseter |
origin: zygomatic arch insertion:angle & ramus of mandible action:elevate mandible |
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masseter location |
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temporalis |
origin: temporal fossa insertion: coronoid process of mandible action: elevate & retract mandible |
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temporalis location |
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