Fig. 5.

Tracings of groups of motorneurons that innervate muscles that are related in operation by position and orientation. A–G, Composites of tracings from several preparations (A, 2; B, 3;C, 4; D, 3; E, 2;F, 3; G, 2). A, The aCC and RP2 motorneurons that innervate muscles DA1-2. B, The four U neurons that innervate the dorsal and lateral muscles DO1-2, DA3, and LL1 (note that this cluster of four neurons may be subdivided further by morphology and target muscles; see text for details).C, The motorneurons innervating the dorsal oblique muscles DO3-5 and muscle DT1. D, The motorneurons that innervate the lateral muscles LT1-4, LO1, and SBM. Note that muscles LO1 and SBM might be innervated by two distinct motorneurons, one of which is shown here. E, The RP1, -3, -4, -5, and the V-neurons innervate the ventral longitudinal muscles. F, Motorneurons innervating the ventral oblique muscles. G, Motorneurons innervating the ventral acute muscles. Note that there is uncertainty as to whether muscles VA1 and VA2 are innervated by two distinct motorneurons (Fig. 3). H, All embryonic motorneurons that innervate the larval body wall muscles of abdominal segment A₇ at stage 16 (adapted from Sink and Whitington, 1991a). For details of the individual dendritic arborizations, refer to Figure 3. Anterior is up.