Orbital margin
Margo orbitalis
Definition
The orbital margin is circular, delimiting the orbital opening, and is subdivided into two borders :
The supraorbital margin, forming the dorsal part, is formed by the frontal and lacrimal bones.
The infraorbital margin, forming the ventral part, is formed by the zygomatic bone.
Variation:
In dogs, cats, and pigs, the orbital rim is incomplete and is completed by an orbital ligament.
References
Barone R. Anatomie comparée des mammifères domestiques, Tome 1, Ostéologie, 5th edition, Vigot, Paris, 2017.
Constantinescu GM, Schaller O. Illustrated veterinary anatomical nomenclature, 3rd Edition, Enke Verlag, Stuttgart, 2012.
