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The posterior cranial fossa is the part of the cranial cavity located between the foramen magnum, and tentorium cerebelli. It is formed by the sphenoid bones, temporal bones, and occipital bone. It lodges the cerebellum, and parts of the brainstem.
A cranial fossa is formed by the floor of the cranial cavity. There are three distinct cranial fossae: [1] Anterior cranial fossa (fossa cranii anterior), housing the projecting frontal lobes of the brain [2] Middle cranial fossa (fossa cranii media), separated from the posterior fossa by the clivus and the petrous crest housing the temporal ...
posterior cranial fossa: hypoglossal canal: 2-hypoglossal nerve (XII) occipital: posterior cranial fossa: foramen magnum: 1: anterior and posterior spinal arteries, vertebral arteries: lowest part of medulla oblongata, three meninges, ascending spinal fibers of accessory nerve (XI) [3] occipital: posterior cranial fossa: condylar canal: 1
The inner surface of the occipital bone forms the base of the posterior cranial fossa. The foramen magnum is a large hole situated in the middle, with the clivus , a smooth part of the occipital bone travelling upwards in front of it.
The posterior surface forms the anterior part of the posterior cranial fossa of the base of the skull, and is continuous with the inner surface of the mastoid portion. Near the center is a large orifice, the internal acoustic opening , the size of which varies considerably; its margins are smooth and rounded, and it leads into the internal ...
The cerebellum is located in the posterior cranial fossa. The fourth ventricle, pons and medulla are in front of the cerebellum. [10] It is separated from the overlying cerebrum by a layer of leathery dura mater, the cerebellar tentorium; all of its connections with other parts of the brain travel through the pons.
The opening to the meatus is called the porus acusticus internus or internal acoustic opening.It is located inside the posterior cranial fossa of the skull, near the center of the posterior surface of the petrous part of the temporal bone.
Middle cranial fossa. Interpeduncular fossa; Posterior cranial fossa; Hypophyseal fossa; Temporal bone fossa Mandibular fossa; Jugular fossa; Infratemporal fossa; Pterygopalatine fossa; Pterygoid fossa; Lacrimal fossa. Fossa for lacrimal gland; Fossa for lacrimal sac; Scaphoid fossa; Condyloid fossa; Rhomboid fossa; In the mandible: Retromolar ...