Sphenoid sinus opens into?
The sphenoidal sinus, like the maxillary sinus, is very small at birth. It occupies the body of the sphenoid but may extend into its greater and lesser wings. The sphenoidal sinus opens into the sphenoethmoidal recess of the nasal cavity. The floor of the sinus is in the roof of the nasal cavity and the nasopharynx. The roof of the sinus is thin. The pituitary fossa bulges into the roof in its posterior half and anteriorly the roof separates the sinus from the optic chiasma and the optic nerves. The lateral wall is also thin and separates the sinus from the cavernous sinus and the internal carotid artery.
Crista galli is associated with which bone?
The crista galli (Latin: "crest of the rooster") is the upper part of the perpendicular plate of the ethmoid bone, which rises above the cribriform plate. The falx cerebri (fold of the dura mater) attaches to the crista galli.
Infratemporal Fossa connect to Middle Cranial Fossa through?
Greater wing of Sphenoid bone connects Infratemporal Fossa to Middle Cranial Fossa.
Newborn has ridge in region of Nasolacrimal duct. Pathology is present in which of the following?
Sphenoid is an example of?
The pneumatic bones are: Frontal. Sphenoid. Ethmoid. Maxilla. Temporal (mastoid air cells)
A mass in Infratemporal Fossa has started eroding floor of middle cranial fossa. Which structure in involved?
The depressed lateral parts of the middle cranial fossa are formed by the greater wings of the sphenoid bone, and the squamous and petrous parts of the temporal bones. They support the temporal lobes of the brain.
Optic Nerve passes to Skull by opening in?
The optic foramen is the opening to the optic canal. The canal is located in the sphenoid bone; it is bounded medially by the body of the sphenoid and laterally by the lesser wing of the sphenoid.
The following structures form the medial wall of the orbit Except:
The medial orbital wall consists of four bones, the frontal process of the maxillary bone: the lacrimal bone, the orbital plate of the ethmoid bone, and the lesser wing of the sphenoid bone.
In the Adult Skull each of the following bones exists in pairs except?
Vomer is also unpaired but it is a facial bone.
Optic canal is located in?
The optic canal is a cylindrical canal running obliquely through the lesser wing of sphenoid bone near the base where it joins the body of sphenoid. It transmits the optic nerve and ophthalmic artery (and its associated sympathetic fibers). The optic canal opens into the skull base at the optic foramen.
Which Sinus reserve as Voice Resonator?
The Superior Orbital Fissure?
A number of important anatomical structures pass through the fissure, and these can be damaged in orbital trauma, particularly blowout fractures through the floor of the orbit into the maxillary sinus. These structures are: superior and inferior divisions of oculomotor nerve (III) trochlear nerve (IV) lacrimal, frontal and nasociliary branches of ophthalmic (V1). abducens nerve (VI) superior and inferior divisions of ophthalmic vein. Inferior division also passes through the inferior orbital fissure. sympathetic fibers from cavernous plexus
Tumor is Spread to Middle cranial fossa from Infratemporal fossa via?
Where is Glabella located?
Below the frontal eminences, and separated from them by a shallow groove, are two arched elevations, the superciliary arches; these are prominent medially, and are joined to one another by a smooth elevation named the glabella.
What structure is located Superio-posterior to Pituitary?
A 17 yrs old motorcyclist met an accident. He noticed double vision especially when he looks up and down . Which bone is most likely fractured?
What is the true location of the pituitary gland?
The sella turcica is located in the sphenoid bone behind the chiasmatic groove and the tuberculum sellae. It belongs to the middle cranial fossa. The sella turcica's most inferior portion is known as the hypophyseal fossa (the "seat of the saddle"), and contains the pituitary gland (hypophysis). In front of the hypophyseal fossa is the tuberculum sellae. Completing the formation of the saddle posteriorly is the dorsum sellae, which is continuous with the clivus, inferoposteriorly. The dorsum sellae is terminated laterally by the posterior clinoid processes.
Fibrous dysplasia commonly occurs in?
Fibrous dysplasia occurs more often in the maxilla than in the mandible Reference: Joseph A. Regezi
Lamina Papyracea separates?
The ethmoid bone encloses ethmoidal cells and is separated from the orbits by the lamina papyracea.
Regarding relation of pituitary?
Relations of Cavernous Sinus: Above: optic tract, optic chiasma, internal carotid artery. Inferiorly: Foramen lacerum and the junction of the body and greater wing of sphenoid bone. Medially: Hypophysis cerebri or (pituitary gland) and sphenoidal air sinus. Laterally: temporal lobe with uncus. Anteriorly: superior orbital fissure and the apex of the orbit. Posteriorly: apex of petrous temporal bone.
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