CDIS 4213 Chapter Notes - Chapter 1 pg. 25-32: Ossicles, Mechanical Advantage, Digastric Muscle
29 Aug 2016
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Muscles can be classed as: parallel, radiating, or pennate. Parallel muscles: have a great range of motion, may shorten by as much as on half their total length, sometimes may have an abundance of fleshy belly and may be referred to as. Other muscles sacrifice a range of motion for an increase in power. Radiating muscles: fan shaped, fasciculi diverge or converge as they approach their attachments. Penniform muscles: composed of fasciculi that converge onto a tendon, depending on complexities they can further be classified as bipennate, multipennate, or circumpennate. Origin: the attachment that is fixed, engages in lesser movement: in the extremities, the origin is the more proximal attachment. Insertion: structure being acted upon: more distal attachment. Skeletal muscles generally produce movement by acting on a joint that lies between the origin and the insertion of the muscle. Bones act as lever arms, and the joint becomes the fulcrum.
