BLG 10A/B Chapter Notes - Chapter 10: Urogenital Triangle, Teres Minor Muscle, Extensor Carpi Muscle
14 Apr 2016
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Generally as a muscle shortens its inserion (atachment on the movable bone) moves towards its origin (ixed or immovable point of atachment) Muscles can be classiied into three funcional groups: Prime mover or agonist: major responsibility for producing speciic movement ex pectoralis major is a prime mover of arm lexion. Antagonist: muscle that opposes or reverses a paricular movement, antagonist. When prime mover is acive, the antagonist may stretch or remain relaxed. Synergists: muscle that aids the acion of a prime mover by efecing the same movement or by stabilizing joints across which the prime mover acts, prevening undesirable movements. Fixator: muscles that immobilize one or more bones, allowing other muscles to act from a stable base. 10. 3 fascicle arrangements help determine muscle shape and force. All skeletal muscles consist of fascicles (bundles of ibers) and their arrangements result in diferent shapes and funcional capabiliies. They surround external body openings, which close by contracing (sphincters)
