09 26 07 - Axial Skeleton II.doc

09 26 07 - Axial Skeleton II.doc - Chapter 9: The...

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Chapter 9: The Postcranial Skeleton: Axial Skeleton Specializations: Reptiles Intervertebral disks – present in amniotes, made of fibrous cartilage More cervical vertebrae with very short or no ribs Trunk ribs articulate with sternum, and movement ventilates the lungs Gastralia are present in crocodilians - dermal bones, often called abdominal ribs More cranial vertebrae than amphibians Cant distinguish between caudal and ___________ verts More cervical vertebrae Turtles: Highly specialized axial skeletons Ribs are expanded to line rib cage 10 vertebrae in the trunk Dorsal “shell” is the carapace ; ventral shell is the plastron Flattened ribs and vertebrae Plastron and perimeter of the carapace develops from gastralia Most of the carapace is modified ribs and vertebrae The limb girdles form on the inside of the carapace. Unusual. The sclerotomal components that form ribs and vertebrae migrate outside of the dermal bones of the girdles Limb bud formed schlerotome cells move laterally to form limb buds rather
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09 26 07 - Axial Skeleton II.doc - Chapter 9: The...

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