Tegmentum n. : A covering; -- applied especially to the bundles of longitudinal fibers in the upper part of the crura of the cerebrum.

Example:


Taxonomy
tegmentum, Midbrain tegmentum, Pontine tegmentum, the brain, free encyclopedia, primitive, neural tube, Divisions, brainstem, Brain, neurons, search, Transverse section, center right, floor, ceiling, unconscious, pathways.

Defination from the web:
tegmentum is the anterior half of the neural tube. However, for fetuses to adults, tegmentum only refers to the parts of the brain that remains relatively unchanged after development is complete, ...