In front of the presphenoid the basicranial axis is continued by the =mesethmoid=.
The parietals and frontals, being membrane bones, are not comparable to the supra-occipital, in the way that the presphenoid and basisphenoid are to the basi-occipital.
The presphenoid is continuous with a second pair of wing-like bones, the =orbitosphenoids=.
The sutures between the basi-occipital and basisphenoid, and between the basisphenoid and presphenoid remain open throughout life.
The side parts of the basisphenoid and presphenoid (forming the alisphenoids and the orbitosphenoids respectively) develop in cartilage separately from the cranial basis, not like the exoccipitals in continuity with it.
The presphenoid might also be considered as a vertebral body, but it develops independently of the basilar plate and trabeculæ.
The presphenoid develops in isolation between the lateral trabeculæ, just behind the point where they fuse.
The front part of the cartilaginous cranium is ossified by a complete ring of bone--the sphenethmoid bone--which embraces part of the ethmoid region, and of the orbitosphenoid and presphenoid regions.
The presphenoid canal between the orbits is large, and the entrance at each end is well separated from the sphenoidal fissure.
The ventral part of the orbit, containing the sphenopalatine foramen, presphenoid foramen, and the sphenoidal fissure, is not constricted as in Liomys, but is open like that of the squirrels.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "presphenoid" in a variety of sentences. We hope that you will now be able to make sentences using this word.
