A tightly distended duradrapery that, from the midline of the skull roof, hangs down into the longitudinal brain crack between the two hemispheres of the cerebrum. At the back, the brain sickle splits into two overgrown leaves, one for hay. and one to the left, which are inserted into the transverse brain crack, i.e. in the gap between the small brain and the posterior part of the large brain. Together they form two dura leaves as well as a lid over the cerebellum, the cerebellum tent (tentorioum cerebelli).
The cerebral sickle and cerebellar tent brace the brain and hold it in place inside the cranial cavity. The upper supreme blood conductor (sinus sagittalis superior)
is enclosed in the attachment of the cerebral cord along the midline of the skull roof.