epiphyseal arch

epiphyseal arch

[ə¦pif·ə¦sē·əl ′ärch]
(embryology)
The arched structure in the third ventricle of the embryonic brain, which marks the site of development of the pineal body.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.