12/28/2023 0 Comments Orbital bone![]() ![]() Other tumors that occur in and around the orbit include osteomas and ossifying fibromas, which involve bone hemangiomas and lymphangiomas, which come from the vascular system rhabdomyosarcoma and fibrous histiocytoma, which arise from developmental cells skin cancers on the eyelids and metastatic tumors that spread to the area from other parts of the body. These tumors may arise within the orbit, or may develop outside the orbit and grow to include it. Another tumor is the orbital meningioma, which comes from the meninges, the protective covering that surrounds the brain and optic nerves. Another relatively common benign neurological tumor in this area is the optic glioma, a tumor that arises from glial cells, the supporting cells in the brain, which also are found in the optic nerve. Its antero-medial surface forms, by its junction. These usually benign tumors, called neurofibromas and schwannomas, can occur on any nerve in the area except the optic nerves, which lack Schwann cells. The orbital process is a thick, strong plate, projecting backward and medialward from the orbital margin. Orbital tumors may arise from Schwann cells, cells in the sheaths that cover nerves. Extended orbital exenteration is a highly disfiguring operation which entails complete removal of the orbital contents including periorbita, eyelids and involved surrounding bony walls with variations tailored to the specific clinical circumstances. Tumors may arise from any of these structures, but neurological surgeons primarily treat those of neural origin, which are the most common tumors of the orbit. ![]() Its volume in the average individual is 30 cc, of which the eyeball contributes. In form, the orbit is roughly a quadrilateral pyramid with rounded angles and resembles a pear. It is formed by three bones: maxilla, zygomatic bone, and palatine bone. The orbital region includes the surrounding bone and the muscles that control the eye, as well as nerves and blood vessels. The orbital bones and the structures contained within the orbit (connective tissue, fat, nerves, vessels) act to support, protect, and maximize the function of the eye. The floor, or inferior wall, separates the orbit and the maxillary sinus. The orbit is the bony socket that contains and protects the eyeball and allows for the optic nerve to pass from the eye to the brain.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |