6 Skeletal MuscleMyofilaments are proteins within the myofibrils that result in contractionActin – thin & has a receptor site for myosinMyosin – thick & has a receptor site for actin and ATPContraction – Myosin heads attach to actin and with ATP perform a Power Stroke
25 Smooth Muscle Involuntary Lateral plate mesoderm in origin Regulates internal environmentInnervated by Autonomic Nervous SystemFound in the wall of tubes and hollow organsIntrinsic Eye musclesErectors of feathers and hairs
44 Axial Muscles – Jawed Fish Horizontal or Lateral SeptumEpaxial MusclesFrom myotomes in embryologyInnervated from dorsal rami of spinal nervesExtend spine & some lateral bendingExtrinsic eye muscles (innervated by cranial nerves)Epibranchial muscles
49 Hypaxial Muscles – Jawed fish Hypobranchial musclesLocated on floor of pharynx, pectoral girdle to jawAre hypaxial muscles that migrated forwardFunction in respiration & feedingE.g. Coracomandibularis, Coracohyoid
51 Axial Muscles - Tetrapods Epaxial trunk musclesDorsal muscles from skull to tailDorsalis trunci in amphibiansLongissimus – long dominant spine extensor in amniotesIliocostalis – most lateral epaxial spine muscle important in reptiles
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