What is sphenoid Planum?
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What is sphenoid Planum?
The planum (or jugum) sphenoidale is a flat surface on the upper aspect of the sphenoid bone that connects the two lesser wings. The limbus of sphenoid bone is a prominent ridge on the body of the sphenoid forming the posterior border of the planum sphenoidale and the anterior border of the prechiasmatic sulcus.
What is the jugum sphenoidale?
Noun. jugum sphenoidale. (anatomy) The structure connecting the two wings of the sphenoid bone.
What type of bone is sphenoid bone?
unpaired bone
The sphenoid bone is an unpaired bone of the neurocranium. It is situated in the middle of the skull towards the front, in front of the basilar part of the occipital bone. The sphenoid bone is one of the seven bones that articulate to form the orbit.
What is the bat shaped bone called?
Shaped like a butterfly or a bat, it has a central body and two lateral wings on either side. It is one of the bones that make up the orbit, in particular, forming the posterior surface. The articulations of the sphenoid are with the frontal, parietal, ethmoid, zygomatic, temporal, occipital, palatine, and vomer bones.
What is Tuberculum Sella?
The tuberculum sellae (or the tubercle of the sella turcica) is a part of the sphenoid bone that is an elevation behind the chiasmatic groove. A variable slight to prominent median elevation forming the posterior boundary of the chiasmatic groove and the anterior boundary of the hypophysial fossa.
What is sphenoid wing meningioma?
Sphenoid wing meningiomas are slow growing tumors that originate from outer arachnoid meningeal epithelial cells. They are the most common tumor of the intracranial space to spread to the orbit.
What is the jugum?
The Jugum is an area at the base of the fore wing of some insects that overlaps the hind wing. The jugum holds the fore and hind wings together during flight. Some species of butterfly, moths and caddisflies possess a jugum on the fore wing.
What is Clinoid process?
clinoid process any of three processes of the sphenoid bone (anterior, medial, and posterior). coracoid process a curved process arising from the upper neck of the scapula and overhanging the shoulder joint; called also coracoid. coronoid process. 1. the anterior part of the upper end of the ramus of the mandible.
Which 4 holes are in the sphenoid bone?
The greater wings also feature four foramina – the foramen ovale, foramen spinosum, foramen Vesalli, and foramen rotundum.
Why is the sphenoid bone so important?
Sphenoid bone has many essential functions. It helps form the base and lateral sides of the skull in combination with the orbital floor. Its many articulations with other bones give the skull rigidity. It is an attachment site for many of the muscles of mastication.
What is the strongest bone in the skull?
Your mandible, or jawbone, is the largest, strongest bone in your face.
What is Planum sphenoidale meningioma?
Planum sphenoidale meningiomas are extra-axial slow-growing tumors arising from the roof of the sphenoid sinus and the area between the optic nerves and the anterior clinoid processes. Enlargement of this meningiomas usually pushes the optic nerves dorsally and caudally causing vision loss as a primary manifestation.
What is the Diaphragma Sellae?
The diaphragma sellae is a sheet of dura mater that forms the roof of the pituitary fossa. It is described as a two-layer sheet of dura mater that merges anteriorly with the dura covering the planum sphenoidale and the anterior cranial fossa and posteriorly with the dura covering the dorsum sellae and the clivus.
Is sphenoid meningioma cancerous?
A sphenoid wing meningioma is a benign brain tumor near the sphenoid bone.
Is sphenoid wing meningioma cancerous?
Sphenoid wing meningiomas are slow growing tumors that originate from outer arachnoid meningeal epithelial cells. They are the most common tumor of the intracranial space to spread to the orbit….Sphenoid Wing Meningioma.
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Why is it called clinoid process?
Clinoid likely comes from the Greek root klinein or the Latin clinare, both meaning “sloped” as in “inclined.”
Where is the clinoid located?
Background: The anterior clinoid process (ACP) is located close to the optic nerve, internal carotid artery, ophthalmic artery, and can be easily injured in an ACP-related surgery.
What is the deepest bone in the skull?
ethmoid bone
The ethmoid bone forms the central part of the floor, which is the deepest area of the anterior cranial fossa.
What nerves pass through sphenoid bone?
The body of the sphenoid bone is more or less cubical and contains the sphenoid sinus. The superior orbital fissure, through which the oculomotor, trochlear, abducens, and ophthalmic nerves pass, is formed on its inferior and lateral margins by the greater wing and on its superior margin by the lesser wing.
