The Adductor Muscles of the Jaw in Some Primitive Reptiles
The book The Adductor Muscles of the Jaw in Some Primitive Reptiles was written by author Fox Richard C. Here you can read free online of The Adductor Muscles of the Jaw in Some Primitive Reptiles book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Adductor Muscles of the Jaw in Some Primitive Reptiles a good or bad book?
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7). The more lateral of these, themasseter, arose from the inner surface and lower margin of thezygomatic bar and inserted on the lateral surface of the coronoidprocess. The medial division or temporal arose from the sagittal crest andsupraoccipital crest and the intervening dermal roof. The muscleinserted on the inner and outer surfaces of the coronoid process andpossibly on the bones beneath. _Thrinaxodon_ represents an advance beyond _Dimetrodon_ in severalrespects. The zygomatic bar in _Thr...inaxodon_ extends relatively farforward, is bowed outward and dorsally arched. Consequently, themasseter was able to extend from an anterodorsal origin to a posteriorand ventral insertion. The curvature of the jaw transforms theanterodorsal pull of the muscle into a dorsally directed adductivemovement regardless of the initial angle of the jaw. This is thegeneralized mammalian condition. With the development of the secondary palate the area previouslyavailable for the origin of large anterior pterygoid muscles wasreduced.
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