Tentorium Cerebelli (Tentorium cerebelli)
Educational content only — not medical advice.
Anatomy
The tentorium cerebelli is a crescentic horizontal fold of dura mater forming an arched roof over the posterior cranial fossa. Separating the occipital lobes of the cerebrum from the cerebellum, its anterior concave free border forms the tentorial notch (incisura tentorii) through which the midbrain passes.
Clinical notes
Transtentorial uncal herniation pushes the medial temporal uncus through the tentorial notch, compressing the ipsilateral oculomotor nerve (blown pupil) and midbrain, rapidly progressing to coma.
Related structures
Educational references
FAQ
What is the role of the Tentorium Cerebelli?
The tentorium cerebelli is a crescentic horizontal fold of dura mater forming an arched roof over the posterior cranial fossa. Separating the occipital lobes of the cerebrum from the cerebellum, its anterior concave free border forms the tentorial notch (incisura tentorii) through which the midbrain passes.
Why is the Tentorium Cerebelli clinically important?
Transtentorial uncal herniation pushes the medial temporal uncus through the tentorial notch, compressing the ipsilateral oculomotor nerve (blown pupil) and midbrain, rapidly progressing to coma.
Source & license
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