Figure 5.

The dendrite is attached to the superior surface of the bristle irrespective of bristle orientation. (A) SEM of the head of a Drosophila. Notice that 14 macrochaetes extend at predictable angles. Bar, 100 μm. (B and C) We cut thin sections through two pupal microchaetes corresponding to those indicated on the adult micrograph. Of interest is that the superior edge of each of these bristles have missing or tiny actin bundles; in each case the dendrite of the nerve (arrow) is located near this edge, even though one of the bristles extends anteriorly (B) and the other posteriorly (C). Bar, 1 μm.