Chevron bone
The chevron bone (spar bone) is a bone on the underside of the caudal spine in some land vertebrates (tetrapods).
It serves as a starting point for the muscles of the tail . Chevron bones occur in many reptiles , both in recent ( bridge lizards , crocodiles) and in fossil forms, but are also formed in some mammals such as whales .
In a broader sense, the chevron bone is the hemeal arch (hemophysis), which is formed by the paired, ventrally (ventrally) oriented dorsal rib of the caudal spine. The actual chevron bone (chevron bone in the narrower sense) is created when the two appendages unite ventrally to form a Y-shaped bone.
The chevron bones (mainly p.) Correspond to the unpaired intercentra of some reptile species, which occur in these on the cervical and trunk spine between two vertebral bodies; in original forms, for example some crocodiles , they serve as a base for the rib head .
Individual evidence
- ^ Klaus Kabisch: Dictionary of Herpetology , VEB Gustav Fischer Verlag Jena, 1990