Abstract
AbstractThe visceral arches are usually assumed to develop in a similar way, from front to rear, with corresponding parts. The mandibular and hyoid arches do not follow such a pattern, rather some of the blastematic tissue of these arches became involved in the formation of the neurocranium as the trabecula and lateral commissure respectively. Thus this tissue was never developed as arch elements. Further, skeletal blastemas in the head are derived from delamination as well neural crest. The implications of these observations are explored.
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