A late 16 dissected embryo stained with 1D4. Note the differences in SNb morphologies in this embryo as compared to the early 17 embryo (see SNb column images for more detail). The ISNs and SNas appear quite similar in early 17 and late 16 embryos, however. In the CNS, note that the outer bundle is discontinuous (only darkly staining patches are visible), and there is more cell body staining than at early 17 (see late 16 CNS detail). To early 17 CNS. Back to early 17 brightfield. To late 16 CNS detail. To early 17 SNb focal plane 3 To diagram of muscles. To 2nd diagram (muscles and motor axons). Back to primer table of contents.

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