basal lamina

n.
  1. The ventral division of the lateral walls of the neural tube in the embryo, containing the neuroblasts that give rise to the somatic and visceral motor neurons.ventral plate of neural tube
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.