|Transverse section through the uterus of a ferret (Mustela putorius furo)|
at 28 days of gestation. From Strahl and Ballmann 1915.
A, allantois; H, hemophagous organ; N. yolk sac
|Electron micrograph of the interhemal region in a ferret placenta.|
Courtest of Dr. Allen C. Enders
|The interhemal region of the ferret placenta.|
Courtesy of Dr. Allen C. Enders
|Hematoidin crystals in the hemophagous region of the ferret placenta.|
From Strahl and Ballmann 1915
The most thorough study of ferret placenta was published a century ago (full reference here). The ultrastructure was later described by Lawn and Chiquoine (here). There are recent reviews of endotheliochorial placentation (here) and placentation in carnivores (here).