Evolution of Oviductal Gestation in Amphibians

Fig. 13. Oviductal epithelial cycle inDermophis mexicanus.
A: Nonpregnant oviduct; epithelium is thin and nonsecretory
(hematoxylin and eosin stain). B: Mid-pregnant oviduct; con-
nective tissue and epithelium are extended into deep folds, and
the epithelium is proliferated, hyperemic, and secretory (stained
with Sudan black B). C: Post-pregnant oviduct; folds are re-
duced, and epithelium is much eroded and a monolayer where
present (hematoxylin and eosin). Bars = 10 Fm. ct = connec-
tive tissue; e = epithelium.