Ox
Nasal bone of ox are elongated curved plates situated in front of the frontals and form the greater part of the roof of the nasal cavity. They do not fuse laterally with adjacent bones even in old age.
The dorsal facial surface is convex. The ventral nasal face is concave. Its medial half forms the dorsal meatus and immediately below it, is the dorsal turbinate crest for the attachment of the dorsal turbinate, bone.
The extreme posterior part is excavated to a small extent in old animals. The lateral border is free and forms the naso-maxillary notch with the premaxilla. The posterior extremities of the two bones together form a projection, which is received into the notch formed by the anterior ends of the frontals.
The anterior end presents two processes separated by a notch and the anterior ends of the two bones together present a trifid appearance.
Horse
The posterior ends of two bones together form a notch into which the pointed anterior ends of the two frontals are received and excavated to form part of the frontal sinus. The anterior end is pointed.
Dog
It is long and wider in front than behind. The dorsal face is concave in its length and forms a central groove with its fellow. The medial borders project into the nasal cavity to form the internal nasal crest. The posterior ends resemble those of the ox. The anterior ends form a semicircular notch
Fowl
It is small thin plate with a body and three processes-frontal, premaxillary and maxillary. These circumscribe the anterior nares with the premaxilla and the maxilla.
