late 16 SNb, focal plane 2

This image clearly shows the difference in morphology between the late 16 and early 17 SNbs. The SNb looks like a growth cone and ends at the 6/13 junction, and it has not yet extended its final branch to 12/13. The 6/7 synapse (adjacent to the left end of the line indicating muscle 14) is still short. Note also the expression of FasII at the 12/13 cleft. This expression is transient and characteristic of a particular short period during mid-late stage 16; it would be stronger a little earlier in development.

To late 16 SNb focal plane 3

To late 16 SNb focal plane 1

To late 16 brightfield

To diagram of muscles.

To 2nd diagram (muscles and motor axons).

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