[2]: 440 The tentorium slopes superior-ward so that the free border is situated at a more superior level than its bony attachment, thus conforming to the shape of the surfaces of the cerebrum and cerebellum with which it is in contact.

[2]: 440 It is attached, behind, by its convex border, to the transverse ridges upon the inner surface of the occipital bone, and there encloses the transverse sinuses; in front, to the superior angle of the petrous part of the temporal bone on either side, enclosing the superior petrosal sinuses.

[citation needed] The posterior end of the falx cerebri attaches onto the midline of the upper surface of the tentorium; the straight sinus runs along this line of junction.

This is called herniation and will often cause an enlarged pupil on the affected side, due to pressure on the oculomotor nerve.

[3] This article incorporates text in the public domain from page 874 of the 20th edition of Gray's Anatomy (1918)