Endochondral bone that sutures with the pterosphenoid anteriorly, the prootic ventrally, the frontal bone dorso-medially, and the pterotic dorso-posteriorly. Occasionally the sphenotic sutures with the parietal bone. The sphenotic separates the orbital from the otic region. The sphenotic bears a large antero-lateral or lateral or ventro-lateral process that borders the postero-dorsal margin of the orbit. The sphenotic is a paired bone. [ http://zfin.org/curator ]