ABSTRACT
Histological investigation of the cat placenta at various stages of development has led to the conclusion that it belongs to the haemochorial type.
Study of the sex chromatin bodies in the nuclei of the so-called ‘endothelial’ and ‘decidual’ cells in the cat placentae of male foetuses has shown that these cells are derived from the embryo and are trophoblastic.
The results of the study of the sex chromatin bodies have confirmed the data of the histological investigation. Consequently the cat placenta should be considered as haemochorial, and not syndesmo-, vaso-, or endotheliochorial.
‘Loculus’ is a local thickening of the uterine horn caused by the presence of the developing embryo with its membranes and with the correspondingly changed maternal tissues.