lamina terminalis
noun
lamina ter·mi·nal·is
| \ -ˌtər-mi-ˈnal-əs
, -ˈnāl-
\
, -ˈnāl-
\
Medical Definition of lamina terminalis
: a thin layer of gray matter in the telencephalon that extends backward from the corpus callosum above the optic chiasma and forms the median portion of the rostral wall of the third ventricle of the cerebrum