cerebrospinal fluid fistula one between the subarachnoid space and a body cavity, such as from head trauma or bone erosion, with leakage of cerebrospinal fluid, usually in the form of rhinorrhea or otorrhea. complete fistula one extending from the skin to an internal body cavity.
Freebase(0.00 / 0 votes)Rate this definition: Vermiform. Vermiform means something shaped like a worm. The expression is often employed in biology and anatomy to describe more or less tubular or cylindrical, usually soft body parts or animals. The word root is Latin, vermes-worms and formes-shaped.
The term piriform, which means pear-shaped, is also sometimes spelled pyriform (as in the diagram on this page.). Deep to the mucous membrane of the piriform fossa lie the recurrent laryngeal nerve as well as the internal laryngeal nerve, a branch of the superior laryngeal nerve.