The clivus (/ˈklaɪvəs/, Latin for "slope") or Blumenbach clivus is a part of the occipital bone at the base of the skull, extending anteriorly from the foramen magnum. It is related to the pons and the abducens nerve (CN VI).
The term is also used for the clivus ocularis, an unrelated feature of the retina.
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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.
The midbrain continues with the thalamus of the diencephalon through the tentorial notch.
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