Correlation between collagen, smooth muscle fibers and elastic system fibers, in percentage, with fetal age, during the fetal period studied (13 to 36 weeks post-conception – WPC).

The points plotted represent the mean values obtained for each week studied. A) Analysis in the corpus cavernosum. Linear regression indicated that the growth is correlated significantly and positively, with fetal age (collagen: r² = 0.9771, p<0.0001; smooth muscle: r² = 0.9516, p<0.0001; elastic fibers: r² = 0.9122, p<0.0001). B) Analysis in the corpus spongiosum. Linear regression indicated that the growth is correlated significantly and positively, with fetal age (collagen: r² = 0.9464, p<0.0001; smooth muscle: r² = 0.9153, p<0.0001; elastic fibers: r² = 0.8299, p<0.0001).