Ox
The malar bone or zygomatic bone is irregularly triangular and is situated between the lacrimal and maxilla
- .It presents three surfaces–lateral, nasal (medial) and orbital-and a zygomatic process, which divided into frontal and temporal branches.
- The lateral or facial surface is extensive and convex. The facial crest runs down the lateral face just below the rim of the orbit and is continued above on the temporal division of the upper extremity and below on the maxilla.
- The orbital face is narrow and forms part of the posterior wall, a part of the floor and anterior wall of the orbit. A ridge separates these two surfaces and forms part of orbital rim.
- The nasal face is free and forms part of the maxillary sinus.
- The posterior extremity is formed by the zygomatic process which divides into a temporal and frontal process.
- The trontal process meets the supra orbital process of frontal to form part of the posterior margin of the orbit.
- The temporal process is overlapped by the zygomatic process of the squamous temporal with which it completes the zygomatic arch.
Horse
- The facial surface is very small.
- The posterior extremity is not divided and is overlapped by the zygomatic process of the squamous temporal.
Dog
- The body consists of a dorsal lacrimal process and ventral maxillary process.
- The facial part is small and convex.
- The zygomatic process forms the bulk of the bone.
- The dorsal border of this process is free anteriorly and forms part of the orbital rim and behind it meets the zygomatic process of the temporal.
- It bears an eminence–frontal process for the attachment of the orbital ligament.
Fowl
- It is a slender rod of bone extending from the maxilla anteriorly and to the quadrate posteriorly.
- The anterior part of the bone is called the jugal and posterior part the quadrato-jugal bone.
