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]

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.

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
References in periodicals archive ?
Outcome on hearing and facial nerve function in microsurgical treatment of small vestibular schwannoma via the middle cranial fossa approach.
The clinical challenge for the physician who encounters unilateral MEE is to identify the small percentage of patients with persistent MEE secondary to eustachian tube invasion or compression by occult lesions of the middle cranial fossa, petrous apex, or infratemporal fossa.
The lesion is extending into the right middle cranial fossa.
Imaging revealed the presence of a Radkowski stage IIIb and Fisch stage IVb JNA that extended into the nasal cavities, the paranasal sinuses, cavernous sinuses, left posterior orbit, and left middle cranial fossa (figure 2, A).
High-resolution computed tomography (CT) of the temporal bone showed partial destruction of the ossicular chain and focally enhancing soft tissue in the middle ear cavity with destruction of the anterior wall and roof of the tegmen and with middle cranial fossa extension.
The most common site of CSF leakage is through the floor of the anterior fossa, which communicate with the ethmoid or frontal sinuses or with the nasal fossa, the sphenoid sinus is rarely implicated as a source of spontaneous CSF fistula communication with the middle cranial fossa.
On computed tomography (CT) with intravenous contrast, a large, soft-tissue nasopharyngeal mass with extension into and erosion of the sphenoid sinus walls, pterygoid plates, and sella turcica and protrusion into the middle cranial fossa was found (figures 1 and 2).
It connects infratemporal fossa to the middle cranial fossa and transmits the mandibular nerve, accessory meningeal artery and lesser petrosal nerve and emissary vein which connects the cavernous venous sinus to the pterygoid venous plexus in the infratemporal fossa.
Imagawa et al reported an enchondroma in the left middle cranial fossa of a patient with generalized enchondromatosis.
GROSS ANATOMY AND CLINICAL CORELATION: The vessels passing through the superior orbital fissure and the cranioorbital foramen contribute to arterial supply of anterior part of dura of middle cranial fossa and form anastomoses between ophthalmic artery and middle meningeal artery or dural branches of internal carotid artery.
The location of an MPNST in the infratemporal fossa and its extension into the middle cranial fossa is very uncommon, as fewer than 50 cases of a maxillomandibular site have been reported in the literature.
Table 10: Showing skull base fractures Cranial Fossa involvement Total number of cases Anterior cranial fossa 11 Middle cranial fossa 15 Posterior cranial fossa 03 Table 11: Showing the anatomical location fracture of vault of skull Anatomical location Number Percentage Frontal 21 21.