The vomer is the thin, flat bone which forms the bottom and back portion of the bony septum in the nasal cavity. The vomer supports the perpendicular plate of the ethmoid bone, which forms the upper portion of this septum. The vomer extends past the palatine bone in the back of the mouth cavity, where its rearmost section, the ala, connects to the pterigoid process of the sphenoid bones and the forward section of the occipital bone, just in front of its basilar part. Research Vomer