As a subject matter expert in the field of avian biology, I'm well-versed in the anatomy of an egg and the developmental stages of an embryo. The question you've posed is quite intriguing and touches upon the fundamental aspects of embryology within the context of avian reproduction.

To begin with, the egg is a marvel of nature, a complex structure designed to support the development of a new life. The part of the egg that contains the baby, or more accurately, the developing embryo, is the yolk. The yolk is the yellow, nutrient-rich center of the egg, and it is where the embryo forms and receives its nourishment during the early stages of development.

Surrounding the yolk is the vitelline membrane, a thin but crucial layer that serves as the yolk's protective barrier. This membrane is essential as it holds the yolk together and provides a stable environment for the embryo to grow.

The thin albumin, also known as the watery part of the egg white that is farthest from the yolk, is not directly involved in the development of the embryo. However, it plays a significant role in the overall structure of the egg. The albumin serves as a shock absorber, protecting the yolk and the developing embryo from physical impacts that might occur during incubation or if the egg is jostled.

It is important to note that the development of the embryo does not begin until the egg is fertilized. Once fertilization occurs, the genetic material from the sperm and the egg combine to form a zygote, which then begins to divide and form the embryo. The yolk provides the necessary nutrients for this initial growth, and as the embryo develops, it will eventually require additional resources, leading to the hatching process and the emergence of the chick.

In summary, the yolk is the part of the egg where the baby, or embryo, is located. The vitelline membrane surrounds and protects the yolk, while the thin albumin is part of the egg white that contributes to the structural integrity of the egg but is not directly involved in embryonic development.

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thin albumin - the watery part of the egg white (albumin) located farthest from the yolk. vitelline (yolk) membrane - the membrane that surrounds the yolk. yolk - the yellow, inner part of the egg where the embryo will form. The yolk contains the food that will nourish the embryo as it grows.read more >>