mesencephalotomy

[ mĕz′ĕn-sĕf′ə-lŏtə-mē ]

n.

Surgical sectioning of any structure in the mesencephalon, especially of the pain-conducting tracts for the relief of unbearable pain.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.