Note for ECOL 485 at UA
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This 1 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Arizona taught by a professor in Fall. Since its upload, it has received 17 views.
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Date Created: 02/06/15
A Cjtmtm I CM articular quadrate dentory tympanum process of inws reflected Orl39CUlGV I quadrate lamina of lympanic angular dentary malleus angutaq C stalpes mcus malleus artlcular stapes manubrium l39 rt39l retroarticular g 4quot Mecke 5 ca loge processl e a9x MAMMKL Figure 32 Interrelationship between the masticatory apparatus and the middle ear in mammalian evolution A reconstruction of a cynodont Thrinaxodon liorhirms in which the quadrate and articular not only formed the jaw joint but also conducted vibrations from the tympanum supported by the reflected lamina of the angular to the stapes B the middle ear in the North American opossum Didelphis virginiana as in other mammals lies behind the squamosodentary joint and retains elements of the soundconducting system of mammallike reptiles C medial View of the jaw in a fetal mammal to show the developmental parallels of the middle ear and jaw joint complex with the ph ogenetic origin of these EDZO l chQOA i t m anum tympanic y p angular 5MM mammalian jaw joint reptilian jaw joint manubrium tympanic reflected retroartlcular lamina of ongular process 2 structures compare withA and F D reconstruction of the teeth and jaws of a RhaetoLiassic mammalEozosrradon in lateral view compare the disposition of the tympanum with that inA aboveE the molar occlusal pattern oonzoslrodon in order to illustrate both the intercuspal relationships and the wear facets the internal surface of the upper molar is viewed as if the tooth were transparent and F reconstruction of the lower jaw oonzostrodon ln media View illustrating relation ships of postdentary bones to the squamosodentary mammalian jaw joint C and ear ossides in inset modified after Gaupp I913 D andF modified after Parrington 197139 Kermack and others 1973 and Allin 1975
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