Final answer:
The cerebral aqueduct is a connection between the third and fourth ventricles in the midbrain. The tectum and tegmentum of the midbrain are the roof and floor of the cerebral aqueduct, respectively. The aqueduct opens into the fourth ventricle between the cerebellum and the pons and upper medulla.
Step-by-step explanation:
The cerebral aqueduct is the connection of the ventricular system between the third and fourth ventricles, located in the midbrain. It passes through the midbrain, with the tectum and tegmentum of the midbrain being the roof and floor of the cerebral aqueduct, respectively. The aqueduct opens into the fourth ventricle, which is the space between the cerebellum and the pons and upper medulla.