Chorioallantoic Pouches.
Chorioallantoic pouches are small pedunculated invaginations into the allantois arranged in a circle around the attachment of the umbilical cord. At the bottom of the picture is a hippomane also described as an allantoic calculus. The latter are generally free-floating in the allantoic fluid.
Roberts SJ (1972)
Chorioallantoic Pouches.
Chorioallantoic pouches are small pedunculated invaginations into the allantois arranged in a circle around the attachment of the umbilical cord. An incidental tan-colored hippomane can be seen near the center of the picture.
Roberts SJ (1972)
Cervical Star.
The cervical star reflects the contact area between the cervical folds and the chorion. The epithelium of the cervix lacks the crypts to connect with the villi of the chorion.
Roberts SJ (1972)
Normal Fetal Membranes.
Examination of the fetal membranes. The nongravid horn has a normal brownish appearance. Chorionic side out.
Pozor MA (2009)
Expulsion of the Fetal Membranes.
Stage 3 of parturition: delivery of the fetal membranes. They are normally delivered within 3 to 6 hours. Mares should be treated within 12 to 24 hours to avoid septicemia, toxemia, and possible postparturient laminitis.
Utrecht (1976)
Retained Fetal Membranes.
Stage 3 of parturition: delivery of the fetal membranes. They are normally delivered within 3 to 6 hours. A knot is tied in the portion of the membranes that is hanging our the vulva to prevent the mare from stepping on the membranes or catching them on something.
Shipley C (2006)