[Vascular network of the entrance area of the trigeminal nerve root into the brainstem].

High-tech methods of surgical treatment of neural diseases require detailed data on the microanatomy on the base of the brain. Using an original method of dissection of the posterior cranial fossa and brain removal from the skull, the data on microanatomical peculiarities of the entrance area of the trigeminal nerve root into the brainstem were received at autopsies on 48 human subjects. Three variants of arterial blood supply to the trigeminal nerve root and three variants of venous drainage from the cerebellopontine angle are described. The suggested method of posterior cranial fossa dissection during an autopsy allows to detect a topographical-anatomical interrelations between the trigeminal nerve root and the vessels of the skull base, which existed in the living patients. Taking into consideration the variants of the superior petrosal vein structure the allows to decrease the probability of complications during the surgical access to the brainstem structures.