paraventricular nucleus

[păr′ə-vĕn-trĭkyə-lər]
n.
  1. A triangular group of large neurons in the periventricular zone of the front half of the hypothalamus, functionally associated with the rear lobe of the pituitary gland.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.