Bone in the cranium of some vertebrates
The parasphenoid is a bone which can be found in the cranium of many vertebrates. It is an unpaired dermal bone which lies at the midline of the roof of the mouth. In many reptiles (including birds), it fuses to the endochondral (cartilage-derived) basisphenoid bone of the lower braincase, forming a bone known as the parabasisphenoid. Early mammals have a small parasphenoid, but for the most part its function has been replaced by the vomer bone. The parasphenoid has been lost in placental mammals and caecilian amphibians.[1]
See also
References
- ^ Atkins, Jade B.; Franz-Odendaal, Tamara A. (2016-04-01). "The evolutionary and morphological history of the parasphenoid bone in vertebrates". Acta Zoologica. 97 (2): 255–263. doi:10.1111/azo.12131. ISSN 1463-6395.
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- Parentheses denote bones that receive a different name in particular clades
- Italics denote neomorphic bones present only in particular clades
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