Lacrimal bone of Ox are situated at the anterior part of the orbits and extend forward on the face.
The lateral surface is divided into facial and orbital parts by the orbital margin (orbito-facial crest).
The orbital part forms the anterior part of the medial wall and floor of the orbit. Immediately behind the crest is the lacrimal fossa at the bottom of which is the posterior opening of the lacrimal canal. On the floor of the orbit is a large and thin walled protuberance-the lacrimal bulla into which the maxillary sinus extends.
The facial part is extensive. The nasal (internal) face presents osseous naso-lacrimal canal, which divides it into two parts. Both the parts enter into the formation of the maxillary sinus.
Horse
It is smaller.
The facial part is less extensive and presents a small lacrimal tubercle about an inch from the orbital margin.
Lacrimal bulla is absent.
Dog
It is very small.
Orbital face is small triangular and has lacrimal canal.
The facial part does not extend beyond the orbital margin.
Fowl
It is triangular plate of bone situated at the anterior margin of the orbit. Its medial edge meets the frontal.
The apex, pointed downward, is continued by a long curved process.
