Its posterior margin is serrated for articulation, with the great wing of the sphenoid and the orbital surface of the maxilla.Īt the angle of junction of the sphenoidal and maxillary portions, a short, concave, non-articular part is generally seen this forms the anterior boundary of the inferior orbital fissure: occasionally, this non-articular part is absent, the fissure then being completed by the junction of the maxilla and sphenoid, or by the interposition of a small sutural bone in the angular interval between them.Its superior margin, rough, and directed horizontally, articulates with the frontal bone behind the zygomatic process.Its anterior margin, smooth and rounded, is part of the circumference of the orbit.Its postero-lateral surface, smooth and convex, forms parts of the temporal and infratemporal fossae.On it are seen the orifices of two canals, the zygomatico-orbital foramina one of these canals opens into the temporal fossa, the other on the malar surface of the bone the former transmits the zygomaticotemporal, the latter the zygomaticofacial nerve. Its antero-medial surface forms, by its junction with the orbital surface of the maxilla and with the great wing of the sphenoid, part of the floor and lateral wall of the orbit. The orbital process is a thick, strong plate, projecting backward and medialward from the orbital margin. The orbital surface of the maxillary process of the zygomatic bone forms a part of the infraorbital rim and a small part of the anterior part of the lateral orbital wall.
The temporal process of the zygomatic bone forms the zygomatic arch along with the zygomatic process of the temporal bone, with a paired zygomaticotemporal foramen present on the medial deep surface of the bone. The orbital surface of the frontal process of the zygomatic bone forms the anterior lateral orbital wall, with usually a small paired foramen, the zygomaticofacial foramen opening on its lateral surface.
Each process of the zygomatic bone forms important structures of the skull. The lateral palpebral ligament attaches to a small protuberance called the orbital tubercle.Įach zygomatic bone is diamond-shaped and composed of three processes with similarly named associated bony articulations: frontal, temporal, and maxillary. The zygomatic nerve passes through the zygomatic-orbital foramen on this surface. The orbital surface forms the lateral part and some of the inferior part of the bony orbit. Near the center of this surface is the zygomaticotemporal foramen for the transmission of the zygomaticotemporal nerve. The temporal surface, directed posteriorly and medially, is concave, presenting medially a rough, triangular area, for articulation with the maxilla (articular surface), and laterally a smooth, concave surface, the upper part of which forms the anterior boundary of the temporal fossa, the lower a part of the infratemporal fossa. The malar surface is convex and perforated near its center by a small aperture, the zygomaticofacial foramen, for the passage of the zygomaticofacial nerve and vessels below this foramen is a slight elevation, which gives origin to the zygomaticus muscle. The zygomatic bone is occasionally referred to as the zygoma, but this term may also refer to the zygomatic arch. The term zygomatic derives from the Ancient Greek Ζυγόμα, zygoma, meaning "yoke". It presents a malar and a temporal surface four processes (the frontosphenoidal, orbital, maxillary, and temporal), and four borders. It is situated at the upper and lateral part of the face and forms the prominence of the cheek, part of the lateral wall and floor of the orbit, and parts of the temporal fossa and the infratemporal fossa. In the human skull, the zygomatic bone (from Ancient Greek: ζῠγόν, romanized: zugón, lit.'yoke'), also called cheekbone or malar bone, is a paired irregular bone which articulates with the maxilla, the temporal bone, the sphenoid bone and the frontal bone.
0 kommentar(er)
