• (n.) An opening at either end of the embryonic neural canal. • (n.) An opening at either end of the embryonic neural canal.
(noor´o-por) an opening in the anterior (rostral) or posterior (caudal) end of the neural tube of the developing embryo; the rostral neuropore is normally closed by 25 to 26 days and the caudal neuropore is usually closed by the end of the fourth week.
Neu'ro·pore noun [ Neuro- + pore .] (Anat.) An opening at either end of the embryonic neural canal. 
Type: Term Pronunciation: nū′rō-pōr Definitions: 1. An opening in the embryo leading from the neural canal of the neural tube to the exterior of the tube.