Merck Manual

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Horn tips of fetal membranes, equine
Horn tips of fetal membranes, equine

Fetal membranes should be carefully examined, making certain that the edematous thicker gravid horn tip (left) and the thinner, puckered nongravid horn tip (right) are present. The most common portion of placenta to be retained is the nongravid horn tip.

Courtesy of Dr. Patricia Sertich.