middle cranial fossa

(redirected from middle 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 ?
Spontaneous middle fossa encephalocele and cerebrospinal fluid leakage: diagnosis and management.
The three main approaches for acoustic neuroma surgeries are the middle fossa, translabyrinthine, and retrosigmoid.
The patient's intraoperative course lasted approximately eleven hours during which time the patient underwent a left middle fossa craniotomy, TMJ arthroplasty, glenoid fossa reconstruction with split-thickness calvarial bone graft, and maxillomandibular fixation.
The cavity created by the open technique should be a smooth mastoid cavity with round edges.6 In our patient, the mastoid cavity was filled with cholesteatoma, a bone defect was present in the posterior and middle fossa, and the facial nerve was completely open in the tympanic and mastoid segments.
Caption: Figure 3: (a) Axial T1-weighted temporal bone MRI showing a signal-hyperintense mass neighboring the posterior cranial fossa and extending to the middle fossa. (b) Axial T2-weighted imaging of the temporal bone shows a high-intensity periphery and low-intensity central mass.
Trigeminal schwannomas are classified in four types according to the locations: Middle fossa type (type A), posterior fossa root type (type B) where the tumor is in front of brainstem, dumbbell-shaped type with both middle and posterior fossa components (type C) and extracranial tumor with intracranial extension (type D).
Online access to eight videos of the most common techniques (middle fossa approach, retro-sigmoid and translabyrinthine craniotomy, transotic approach, combined petrosal approach, temporal bone resection, auditory brainstem implant, and blind closure and cerebrospinal fluid leak repair) is included.
Henry Battle, in 1890, had originally associated mastoid ecchymoses with fracture of posterior cranial fossa of skull, not a middle fossa fracture.
Nevertheless, we strongly think that an otologic surgeon should be able to perform the traditional microscopic approaches, such as translab or middle fossa, before starting to employ the endoscopic corridor.
The most common locations for intracranial arachnoid cysts are the middle fossa (near the temporal lobe), the suprasellar region (Near the third ventricle) and the posterior fossa, which contains the cerebellum, pons, and medulla oblongata.
The erosion extended up to the middle fossa dural plate, and it had damaged the geniculate ganglion.

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