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These elements are a central piece or sternite, and a lateral field on each side bearing the leg-rudiment.

They do not long persist in the embryo, but disappear, and the area each one occupied becomes part of the sternite.

The vagina usually opens in front of the eighth abdominal sternite.

The longitudinal segmented band along the middle line represents the early segmentation of the nervous system and the subsequent median field of each sternite; the lateral transverse unshaded bands are the lateral fields of each segment; the shaded areas indicate the more internally placed mesoderm layer.

Urosternite, ū-rō-ster′nīt, n. the sternite of any somite of the urosome of an arthropod.