PSYB65H3 Lecture Notes - Lecture 2: Hindbrain
Document Summary
The biological symmetry of embryos of vertebrate species as diverse as the amphibians and mammals is strikingly similar in the early stages of development. In the evolution of complex nervous system, simpler and evolutionary more primitive forms have not been discarded and replaced but rather have been added to. An example of this is the forebrain in mammals, the forebrain invertebrates has grown dramatically over the course of vertebrate evolution. In all species, the primitive form of the forebrain exists, but has been added to. The functioning of the forebrain therefore occurs on different levels in all types of species due to its evolution. As a result all anatomical and functional features of simple nervous systems are present in the most complex nervous systems, including ours. The nervous system of a young vertebrate embryo begins as a sheet of cells that folds into a hollow tube and develops into three region: forebrain, midbrain and the hindbrain.
