We will first trace the features manifest in the development of the brain in all vertebrates and then point out some of the peculiarities found in higher vertebrates, especially in mammals and in man. The anterior brain vesicle, the prosencephalon, gives rise at its anterior end to the telencephalon. The latter produces in an early stage two bulges directed anterolaterally [...]
When the epidermis is first segregated from the other parts of the ectoderm (neural plate, neural crest) during the process of neurulation, it is still a very complex rudiment. Most of it becomes the epidermis of the skin, but in addition, a number of other structures are derived from it. Some of these are – the lens, the cornea, and [...]
In this article we will discuss about the development of eyes in all vertebrates. The Optic Cup: The optic vesicles push outward until they reach the epidermis, displacing the intervening mesenchyme, so that they come into direct contact with the inner surface of the epidermis. Next, the external surface of the optic vesicle flattens out and invaginates inward, so that [...]