Figure 7.

(A) Socket cell extension during the emergence (32-h pupa) of a microchaete from the surface of the thorax. Of interest is that the anterior surface of the socket cell (SC) extends outwards over what will be the superior surface of the microchaete. Within an infolding in the microchaete is the nerve (N). (B) Thin section cut through a newly emerging bristle from the leg of a 32-h pupa. As in A, the SC extends over what will be the superior surface of the bristle. Just beneath this expanding portion of the socket is the dendrite of N that will innervate the bristle. Bar, 1 μm.