Vomer bone of ox is a “U” or “V” shaped median bone, which forms the ventral part of the septum nasi.
It is composed of a thin lamina, which is bent so as to form a groove to receive the perpendicular plate of the ethmoid and the septal cartilage.
The lateral surfaces are covered by mucous membrane in life.
The posterior part partly divides the posterior nares and is made up of two wings applied against the body of presphenoid to form the vidian or pterygoid canal.
The ventral border lies in the groove formed by the palatine processes of the premaxillae and the maxillae and posteriorly is free and separated from the nasal floor by a considerable interval and hence the two posterior nares are separated only in the upper part.
Horse
The ventral border is attached to the nasal crests of the maxillae and so the posterior nares are completely separated in the skull.
Dog
Posteriorly it is not in contact with the floor of the nasal cavity and does not divide completely the posterior nares.
Near the posterior nares the two plates of vomer curve outward and join the lamina lateralis of ethmoid and the palatine bones to form the lamina transversalis.
Fowl
It is a slender rod extending forward from the rostrum of the sphenoid and is part of the nasal septum and is attached above to the septal cartilage in its anterior part.
