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The falx cerebelli is a small sickle-shaped fold of dura mater projecting forwards into the posterior cerebellar notch as well as projecting into the vallecula of the cerebellum between the two cerebellar hemispheres. [1] The name comes from two Latin words: falx, meaning "curved blade or scythe", and cerebellum, meaning "little brain". [2]
The free border of the tentorium is U-shaped; it forms an aperture - the tentorial notch (tentorial incisure) - which gives passage to the midbrain.The free border of each side extends anteriorly beyond the medial end of the superior petrosal sinus (i.e. the apex of the petrous part of the temporal bone [citation needed]) to overlap the attached margin, thenceforth forming a ridge of dura ...
The tentorial notch (also known as the tentorial incisure or incisura tentorii) refers to the anterior opening between the free edge of the cerebellar tentorium and the clivus for the passage of the brainstem. [1] [2] The midbrain continues with the thalamus of the diencephalon through the tentorial notch. [3]
Increased pressure in the posterior fossa can cause the cerebellum to move up through the tentorial opening in upward, or cerebellar herniation. [8] The midbrain is pushed through the tentorial notch upward. This is also known as ascending transtentorial herniation since it occurs across the tentorium cerebelli.
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.
The cerebellum is located in the posterior cranial fossa. ... The medial branch continues backward to the cerebellar notch between the two hemispheres of the ...
Kernohan's notch is a cerebral peduncle indentation associated with some forms of transtentorial herniation (uncal herniation). [ 1 ] [ 2 ] It is a secondary condition caused by a primary injury on the opposite hemisphere of the brain. [ 3 ]
Moving rostrally, the inferior, middle, and superior cerebellar peduncles are found connecting the midbrain to the cerebellum. Directly rostral to the superior cerebellar peduncle, there is the superior medullary velum and then the two trochlear nerves.