1: Dorsum sellae of the sphenoid bone 2: Superior borders of the petrous part of the temporal bone The posterior cranial fossa is the part of the cranial cavity located between the foramen magnum, and tentorium cerebelli.

[2] The foramen magnum is a large opening of the floor of the posterior cranial fossa, its most conspicuous feature.

It transmits the facial (VII) and vestibulocochlear (VIII) cranial nerves into a canal in the petrous temporal bone.

Lies at the anterolateral margins of the foramen magnum and transmits the hypoglossal nerve (CN XII).

The posterior cranial fossa is formed in the endocranium, and holds the most basal parts of the brain.