posterior cranial fossa


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Related to posterior cranial fossa: Middle cranial fossa

pos·te·ri·or cra·ni·al fos·sa

[TA]
the internal base of the skull posterior to the crest of the petrous part of the temporal bones and the dorsum sellae and anterior to the grooves for the transverse sinuses, where the cerebellum, pons, and medulla oblongata rest.
Synonym(s): fossa cranii posterior [TA]

posterior cranial fossa

The posteriormost of the three divisions of the internal cranial base, which houses the inferior face of the cerebellum posteriorly and the pons and medulla oblongata anteriorly. The floor of the fossa is the largest and deepest depression of the inner surface of the base of the brain, and is covered by dura mater. The posterior cranial fossa is bounded anteriorly by the dorsum sellae of the sphenoid bone; laterally by the superior margin of the petrous part of the temporal bone and the mastoid angle of the parietal bone; and posteriorly by the squamous part of the occipital bone below the transverse sinuses.

posterior cranial fossa

The posterior third of the floor of the cranial cavity; it is larger and deeper than the anterior and middle cranial fossae. The posterior cranial fossa is formed from the posterior surface of the body of the sphenoid bone (the dorsum sella), the posterior surfaces of the petrous and mastoid portions of the temporal bones, and the inner surfaces of the occipital bones. The posterior cranial fossa contains the internal auditory canals, the foramen magnum, and the jugular foramina. The brainstem, the cerebellum, and the transverse and sigmoid sinuses lie in the posterior cranial fossa.
See also: fossa
References in periodicals archive ?
However current study revealed that point counting method can produce accurate volume estimations and is effective in determining volume estimation of intracranial and posterior cranial fossa.
Strict followup is needed in many of the posterior cranial fossa tumours especially ependymoma, haemangioblastoma and pilocytic astrocytoma as they have tendency to recur frequently.
Nicholas D Coppa, Johnny B Delashaw Jr: Reconstruction After Posterior Cranial Fossa Surgery-Case Report of Application of a Synthetic Tissue Sealant to Augment Dural Closure.
Relation of arteries to roots of nerves in posterior cranial fossa in man.
Posterior cranial fossa and temporal bone meningioma in a child, appearing as a neck mass.
Cystic malformations of the posterior cranial fossa originating from a defect of the posterior membranous area.
Pneumocephalus is said to be of otogenic origin when a head trauma involving the temporal bone results in the creation of a fistulous communication between the middle or posterior cranial fossa and the pneumatized temporal bone.
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.
This canal appears to be a vulnerable area through which tumors may extend unobstructed into the internal auditory meatus and posterior cranial fossa.
Knowledge of this anatomical land mark is a clue in radiological diagnosis of lesions in the posterior cranial fossa (6) and has been associated with headache, Barri Lieou syndrome, photophobia and migrane.
Computed tomography (CT) of the brain and temporal bone demonstrated an extensive opacification of the right mastoid process and indications of erosion of the mastoid surface that created an opening to the posterior cranial fossa at the level of the sigmoid sinus (figure 1).
When evidence on CT suggests invasion into the middle or posterior cranial fossa, further imaging is required before surgery can be undertaken in order to exclude intracranial extension.

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