DEPLETIONS OF PHARYNGEAL ARCH CARTILAGES FOLLOWING EXTIRPATION OF CRANIAL NEURAL CREST IN CHICK EMBRYOS

Abstract
Extirpation of the neural crest and the adjacent neural fold from the pre-otic region in chick embryos of 5 and 6 somites results in absence of the interorbital plate and Meckel''s cartilage. Removal of the neural crest and adjacent neural fold from the post-otic region in chick embryos of 6 to 12 somites results in absence of the hyoid apparatus.