The Development of the Integument Spatial, Temporal, and Phylogenetic Factors

SYNOPSIS The development of hair teeth and feathers is leviewed in the context ot experimental manipulation of dermal epideimal interactions The inductive role of the del mis is described, and the consequences of altering the ages and sources of the interacting tissue components is demonstrated The importance of examining the developmental capibilities of these tissues after disruption of the dermal epidermal inteiface as well as in intact explants is discussed In addition the role of the basement membrane m establishing and stabilizing integumental denvatrves and the role of collagen synthesis and depositionis examined