VAN 121: Veterinary Gross Anatomy-II (2+2)

CEREBRAL AQUEDUCT

• The cerebral aqueduct or aqueduct of Sylvius is a narrow passage through the mesencephalon and connects the third and fourth ventricles.
• It is situated at the median plane.
• The shape of the lumen is variable at different places. It is lined by ciliated columnar epithelium.
• Surrounding it is a layer of gray mater which is continuous anteriorly with the third ventricle and posteriorly with the gray mater of the fourth ventricle. This gray mater accommodates the nuclei of the third, fourth and fifth cranial nerves.