middle cranial fossa


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Related to middle cranial fossa: Posterior cranial fossa

mid·dle cra·ni·al fos·sa

[TA]
a butterfly-shaped portion of the internal base of the skull posterior to the sphenoidal ridges and limbus and anterior to the crests of the petrous part of the temporal bones and dorsum sellae; it lodges the temporal lobes of the brain in the lateral portions, and the hypophysis centrally.
Synonym(s): fossa cranii media [TA]
Farlex Partner Medical Dictionary © Farlex 2012

middle cranial fossa

An irregular depression in the middle of the inner surface of the base of the skull. which houses the temporal lobe of the brain laterally and the hypophysis at its centre. It consists of a central and two lateral portions. The middle cranial fossa is bounded anteriorly by the posterior margin of the lesser wings of the sphenoid bones and the anterior margin of the sulcus chiasmatis, and posteriorly by the superior margins of the petrous parts of the temporal bones and dorsum sellae of the sphenoid bone; laterally, the middle cranial fossa merges with the lateral wall  of the skull on either side. The floor of the middle cranial fossa is comprised of the body and greater wings of the sphenoid bone and the anterior surfaces of the petrous parts of the temporal bones.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

middle cranial fossa

The middle one-third of the floor of the cranial cavity; it is deeper and wider than the anterior cranial fossa. The middle cranial fossa is formed from the posterior two thirds of the sphenoid bones (the greater wings, the dorsum sella, and the clinoid processes) and the petrous and squamous portions of the temporal bones. The middle cranial fossa contains the superior orbital fissures, optic canals, foramina rotundum, foramina ovale, foramina spinosum, and foramina lacerum. The temporal lobes of the cerebral hemispheres, the optic chiasm, the hypophysis (pituitary), internal carotid arteries, circle of Willis, and cavernous sinuses lie in the middle cranial fossa.
See also: fossa
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
(Middle Cranial Fossa showing Unilateral Foramen Vesalius)
Cerebrospinal fluid (CSF) flow was noted from a defect in the dura in the middle cranial fossa and was terminated by applying pressure gauze.
The axial projection can demonstrate several characteristics, including a rounded mass within the nasopharynx; tumor extension in the nasal cavity; widening of the pterygopalatine fossa on the side of the tumor; distortion of facial planes in the subtemporal space; indentation of the posterior wall of the antrum by pressure erosion from the tumor mass; and possible invasion of the orbit, sphenoid sinus or middle cranial fossa.[5] Of the above-mentioned characteristics, it is most important to visualize intracranial extensions because they greatly affect the choice of treatment.
The transpetrous, retrosigmoid, and middle cranial fossa (MCF) routes are the traditional and most widely used approaches to reach lateral skull base neoformations.
2 patients with comminuted fracture underwent middle cranial fossa decompression.
A head CT was performed, which revealed a previously seen left middle cranial fossa meningioma and associated edema.
While CT imaging showed a posterior nasal mass protruding through a defect in the clivus, MRI revealed an extradural mass containing admixed dentigerous and adipose pockets extending from the middle cranial fossa through the basisphenoid with associated dramatic duplication of the pituitary gland and vertebrobasilar feeders.
Among the topics are the anatomy of the temporal bone, endoscopic middle ear dissection, trans-labyrinthine exposure of the internal auditory canal, the middle cranial fossa approach to the internal auditory canal, and achieving mastery in temporal bone dissection: the role of deliberate practice and formative feedback.
We report a case involving a patient with bilateral middle cranial fossa encephaloceles extending into the middle ear and causing conductive hearing loss.
Middle cranial fossa cholesteatoma following temporal bone trauma.