n. a reed-like structure forming a third of the floor of the brain's fourth ventricle. Located at the caudal end, it is continuous with the medulla oblongata. Also called the inferior fovea of the rhomboid fossa.

CALAMUS SCRIPTORIUS: "The calamus scriptorius forms part of the inferior floor of the 4th ventricle."
Cite this page: N., Pam M.S., "CALAMUS SCRIPTORIUS," in, April 7, 2013, (accessed April 17, 2021).