Final answer:
The channel for the veins within the skull is called the cavernous sinus, which leads to the internal jugular vein.
Step-by-step explanation:
The channel for the veins within the skull is called the cavernous sinus. It receives blood from the transverse sinuses and leads through the jugular foramen to the internal jugular vein. The cavernous sinus is an enlarged vein that is part of the venous drainage system of the brain.