Studies on the pigments in the uterus and placenta of sheep.
Gadev, C., 1971: Studies on the pigments in the uterus and placenta of sheep.. Zentralblatt fur Veterinarmedizin 18A(Heft 6): 521-529
Pigment was observed in the uterus of two older sheep out of a total of 130 slaughter sheep. Histological studies showed that the pigment cells are of connective tissue origin. It is suggested that the branched pigment cells which surround the uterine vessels are adventitial cells (pericytes), whereas the rounded, non-branched pigment cells are macrophages (histiocytes). The pigment within the cells is formed from pseudo-melanin.