At what point in fetal life are what anatomists come to call flexure creases?

解剖学家所说的弯曲褶儿生命的哪个阶段出现？

Even in the rude circumferential rim or wall of wax round a growing comb, flexures may sometimes be observed, corresponding in position to the planes of the rhombic basal plates of future cells.

即使生长中的梳子周围粗糙的圆周缘或蜡壁中，有时也可以观察到弯曲， 其位置与未来细胞的菱形基底板的对应。

The transverse colon passes horizontally to the left toward the spleen and turns downward (splenic flexure) to the descending colon.

横结肠水向左朝脾脏，向下（通过脾曲）成为降结肠。