ZOL - ZOL 328 Epaxial muscles in amniotes group dorsalis trunci straighten vertebral column sideways flexing of vertebral column greater

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ZOL 328 04/02/08 Epaxial muscles – in amniotes - group – dorsalis trunci - straighten vertebral column - sideways flexing of vertebral column greater flexibility; backward arching of back - muscles of the back become straplike; extend over many segments of body e.g. longissimus dorsi Hypaxial muscles – amniotes - form much of the body wall 4 groups: 1. subvertebrals – flex vertebral column 2. oblique sheets & 3. transverse sheets – int. and ex. Oblique - support, flexion - ventral - respiration, esp intercostals (mammals) ??? 3. rectus abdominus – - supports viscera - flexes trunk Mammals – diaphragm - from hypaxial muscle - separates pleural and peritoneal cavities - aids in respiration II. Appendicular muscles - muscles that insert on limbs and girdles Fish – extensors are on the dorsal side and elevate the fins - flexors are on the ventral side and depress the fins Tetrapods – very important in all more numerous more complex - have taken over locomotory function Dorsal muscles – tend to abduct and extend limb
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This note was uploaded on 06/29/2008 for the course ZOL 328 taught by Professor Hill during the Spring '08 term at Michigan State University.

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ZOL - ZOL 328 Epaxial muscles in amniotes group dorsalis trunci straighten vertebral column sideways flexing of vertebral column greater

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