MSD Manual

Please confirm that you are a health care professional

honeypot link
Sonogram of 37-day conceptus, mare
37-day-conceptus-sonogram-mare-sertich-sized
Sonogram of 37-day conceptus, mare

    By 37 days of gestation, most of the anechoic fluid in the conceptus is allantoic fluid, and the yolk sac is a very small anechoic space dorsally. The fetus is suspended at the dorsal aspect of the conceptus by the umbilical cord.

Courtesy of Dr. Patricia Sertich.