NB 4-2

Segregation wave: S2

In the late embryo the clone consists of 10 to 16 cells in the lateral cortex. Beside the RP2 motoneuron (Goodman et al., 1984; Doe et al., 1988a; Patel et al., 1989a) it comprises about two additional motoneurons (4-2Mia; ÒCoRÓ in Chu-LaGraff et al., 1995) and several interneurons projecting contralaterally across the anterior commissure (4-2I;  see also Udolph et al., 1995; Chu-LaGraff et al., 1995). The RP2 has an ipsilateral anterior projection that exits through the posterior root of the intersegmental nerve and arborizes on one dorsal muscle (muscle DA3 or DA2; see also Sink and Whitington, 1991). The 4-2Mia project ipsilateral and posteriorly through the anterior root of the intersegmental nerve and innervate two muscles of the ventral longitudinal group (most likely muscles VL3 and VL4). Thus, the lineages of the adjacent NB 3-2 and NB 4-2 exhibit similar features (comparable to the situation described for NB 2-2 and NB 1-1).

Flybrain    Development    Neuroblast Lineage    NB 4-2

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