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). Back to table of contents

(click on image to enlarge)