The Uterus: Changes in the Uterus during the Estrous Cycle LowRes
Domestic animals are either monestrous or polyestrous. Monestrous animals such as bitches have one estrous cycle per year; each cycle is followed by a long anestrous period. Polyestrous animals are either continuously cycling without an anestrous period such as cows and sows or seasonally cycling with an anestrous period such as mares, ewes, goats and queens. The uterine wall, especially the endometrium, undergoes greater changes in the monestrous animal than in the polyestrous animal but changes can be clearly seen in polyestrous animals.
During the estrous cycle the uterus undergoes changes controlled by hormones secreted by the ovary. The changes are most pronounced in the glands in the tunica submucosa of the endometrium and in the smooth muscle and stratum vasculare located in the tunica muscularis.
The Chart and Diagrams below allow you to see the differences in the uterine wall between Proestrus, early in the estrous cycle, and Diestrus, later in the estrous cycle. First read through the text and view the associated images, then review the material by comparing the appearance of the uterus in proestrus versus diestrus by using the colored bars below the text.
Monestrous (not shown on
Point to (don't click) the name in the chart below to change the uterus images.LowRes
|Diestrus||Labeled||Diagram Overlay||Perimetrium||Myometrium||Stratum vasculare||Endometrial Glands||Diagram|
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