Morphogenesis of the ovary of a chicken embryo in the germinal period of embryonic ontogenesis

Abstract

The article is devoted to the morphogenesis of the ovary of chickens in embryonic ontogenesis, namely, in the embryonic period, which lasts from the beginning of incubation to the 8-day age of the chicken embryo. The aim of the study was to study the morphology of the development of the ovary of chickens in early embryonic ontogenesis. The objectives of the study included: determining the timing of the onset of ovarian development in chicken embryos; determining the age of the chicken embryo in which the reduction of one of the gonads begins, namely the right one; determining the size of epithelial cells; describing the morphology of gonocytes. It has been established that the development of gonads in chicken embryos, in particular the ovary, begins on the fourth day of embryogenesis in the form of two strips. By the sixth day, the right and left gonads are already roller-shaped bodies with a covering epithelium and a capillary system. At the seven day age of the embryos, the reduction of the right ovary begins. At the eight day age of embryos, the thickness of the integumentary epithelium of the left ovary is 1,3 times higher than that of the right ovary, since the thickness of the epithelium in the left ovary was 6,9 microns, whereas in the right one 5,4 microns. By the end of the embryonic period, namely by the age of 8 days, there is no clear division of the organ into cortical and cerebral matter in the developing ovaries, there is an increase in vascularization of the organ and a decrease in the density of gonocyte placement. It should also be noted the intensive growth of the chicken embryo itself in the embryonic period, since the weight of the embryo increased 11 times from 4 to 8 days of age.