Circumsect

The eye is circumsected near the margin of the iris, exposing the lens in the cup formed by the anterior half of the eye.

If the stimulated cortical zone is circumsected so that most of the pathways available for intracortical elaboration of the excitation are severed, conditioned reflexes still occur to the cortical conditional stimulus.

Finally, a special knife which can be rotated after insertion into the brain to circumsect a specific region completely has been devised and used with great advantage to disjoin the hypothalamus from the brain stem.