White yolk spheres refer to small, round structures found within the egg yolk of avian species, commonly referred to as "white yolk." These spheres, also known as vitelline spheres, are proteinaceous granules that play a crucial role in the development and nourishment of the growing embryo.
These spheres are composed of various proteins, lipids, minerals, and vitamins that are essential for the embryo's growth and development. They typically measure around 1-2 micrometers in diameter and are dispersed throughout the egg yolk.
White yolk spheres are formed during the process of oogenesis, where oocytes (immature eggs) undergo several maturation stages within the ovaries of female birds. As the oocyte matures, these spheres accumulate within the yolk cytoplasm.
During fertilization, the sperm penetrates the egg and releases its genetic material, initiating the development of the embryo. The white yolk spheres then provide a nutrient-rich environment, supplying vital substances necessary for the early stages of embryonic development.
White yolk spheres also act as a reservoir of nutrients and serve as a source of energy for the developing embryo during its incubation period, ensuring proper nourishment and growth. As the embryo continues to develop, these yolk spheres gradually diminish in size and are eventually consumed or utilized for various physiological processes.
In summary, white yolk spheres are proteinaceous granules within the egg yolk that serve as a crucial source of nutrients, minerals, and vitamins for the developing avian embryo, aiding its growth and development during the incubation period.
