[Quantitative morphological studies of effects of pregnancy, parturition and lactation on omental milk spots in the mouse (author's transl)].

Effects of pregnancy, parturition and lactation on milk spots of the mouse were quantitative-morphologically examined. In the mouse, as reported previously, omental milk spots were morphologically classified into two types; type I and type II. Type I milk spots, which are seen along the perivascular fatty tissue around the omental vessels, are increased in size at the end of pregnancy and show significant enlargement after parturition. They are developed remarkably in lactating mice, and moderately in non-lactating mice. Type II milk spots, which are scattered throughout the omentum, are increased at parturition and remain well developed both in lactating and non-lactating mice. In the mesentery, milk spots normally are not observed. However, type II milk spots appear at the end of pregnancy. They increase after parturition, especially in non-lactating mice. In addition, type I milk spots are sometimes seen in the mesentery of non-lactating mice.