[BIOL 205] - Final Exam Guide - Ultimate 23 pages long Study Guide!

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29 Mar 2017
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Main attachment of jaws to rest of skull is by hyoid arch (mainly. Hyomandibula forms swinging bridge that allows jaw to protrude forward. Upper + lower jaw can strike prey at same time. Maxilla + premaxilla loosely articulated to chondrocranium and to each other, allowing protrusion of upper jaw. Chondrocranium is lifted when jaw opens because it articulates with vertebral column. Hyoid apparatus -> when mouth opens, these struts push lateral walls of buccal cavity outwards -> increases volume of buccal cavity. In some, premaxilla lost its mobility and is fused to chondrocranium. hyomandibula) + some other bones. Jaw attached to braincase directly by quadrate bone of upper jaw. Quadrate bone articulates with articular bone -> this is the joint b/w upper and lower jaw. Hyomandibula reduced to columella (small, thin bone of middle ear). Dentary articulates with squamosal bone -> this is joint b/w upper and lower jaw. Small, cartilaginous vertebrae on dorsal side of notochord.

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