Orbit skull5/30/2023 ![]() Test yourself on the bones found in the anterior view of the skull in this quiz. In addition, the posterior border of the zygomatic process forms the beginning of the temporal line. They begin at the lateral aspect of the supraorbital margin and end at the zygomaticofrontal suture that connects the frontal bone and the frontal processes of the two zygomatic bones. The z ygomatic processes project inferolaterally on each side of the frontal bone. When viewed from the inferior view, the anterolateral portion of the orbital part of the frontal bone presents with the lacrimal fossa (for the lacrimal gland) while the anteromedial portion has a trochlear fossa that forms a point of attachment for the corresponding superior oblique muscle. In contrast, its superior surface forms the greater part of the floor of the anterior cranial fossa. It is named 'orbital' since its inferior surface comprises most of the roof of the orbit. Each plate is a triangular-shaped flat sheet of bone that extends posteriorly from the supraorbital margin. The orbital parts contain orbital plates. Orbital plate of frontal bone, Orbital part of frontal bone The nasal spine supports the bridge of the nose. Projecting from the central portion of the nasal notch is a median process known as the nasal spine. The main feature of this part is the nasal notch that serves for the articulation with the nasal bones and frontal processes of the maxilla. The nasal part is a small portion of the frontal bone that projects inferiorly between the right and left supraorbital margins. The foramen cecum are two small foramina situated on each side of the posterior end of the frontal crest. This crest is continuous with the sagittal sulcus. The internal surface is deeply concave and presents a ridge located in the midline known as the frontal crest. The zygomatic processes arise caudolaterally from the squamous part and articulate with the zygomatic bone. In addition, located along the frontal part of the orbital margin, at the superior border of the orbit (supraorbital margin) is the supraorbital foramen or notch where the supraorbital vessels and nerve pass through. Above the supraciliary arch, the external surface displays an elevation known as the frontal tuber (frontal eminence). Between the two arches, there is a prominence known as the glabella. The external surface above the supraorbital margin hosts a curved elevation known as the supraciliary arch. The external surface is convex and corresponds to the forehead. It is composed of two surfaces: An external and an internal surface. The squamous part forms the largest portion of the frontal bone. The frontal bone is one of the skull bones enclosing the brain ( neurocranium) and it consists of the following parts: Parietal bones (frontoparietal or coronal suture) Zygomatic bone (zygomaticofrontal suture) Squamous part, nasal part, two orbital parts (plates) and two zygomatic processesĬreates the smooth curvature of the forehead protects the frontal lobe of the brain Shell-shaped cranial bone located in the forehead region Key facts about the frontal bone Definition This article will discuss the anatomy and function of the frontal bone. In addition, it participates in the formation of several cavities of the skull such as the orbit and the anterior cranial fossa. The main function of the frontal bone is to create the smooth curvature of the forehead and to provide protection for the frontal lobe of the brain. The frontal bone consists of six main parts: the squamous part, nasal part, two orbital plates and two zygomatic plates. The frontal bone is a shell-shaped, unpaired, flat bone of the skull located in the forehead region.
0 Comments
Leave a Reply. |