Tag Archives | Ectodermal Organs

Cranial Nerves and Ganglia of Vertebrates | Ectodermal Organs | Embryology

The cranial nerves of verte­brates, when compared with the spinal nerves, show a great diversity in configuration, distribution, and function and the same diversity can also be noted in their development in the embryo. To start with, the two most anterior nerve pairs, nerves I (olfactory) and II (optic), are completely different in nature and cannot be in any way [...]

By |2018-04-30T10:44:12+00:00April 30, 2018|Ectodermal Organs|Comments Off on Cranial Nerves and Ganglia of Vertebrates | Ectodermal Organs | Embryology

Development of the Brain in Vertebrates | Ectodermal Organs | Embryology

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 [...]

By |2018-04-30T10:44:12+00:00April 30, 2018|Ectodermal Organs|Comments Off on Development of the Brain in Vertebrates | Ectodermal Organs | Embryology

Fate of the Epidermis | Ectodermal Organs | Embryology

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 [...]

By |2018-04-30T10:44:12+00:00April 30, 2018|Ectodermal Organs|Comments Off on Fate of the Epidermis | Ectodermal Organs | Embryology