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Dorsal nerve cord

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Title: Dorsal nerve cord  
Author: World Heritage Encyclopedia
Language: English
Subject: Chordate, Vertebrate, Muscle arms, Evolution of nervous systems, Inversion (evolutionary biology)
Collection: Chordate Anatomy, Embryology of Nervous System
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Dorsal nerve cord

The dorsal nerve cord is one of the embryonic features unique to chordates, along with a notochord, a post-anal tail, an endostyle, and pharyngeal slits. The dorsal nerve cord is a hollow cord dorsal to the notochord. It is formed from a part of the ectoderm that rolls, forming the hollow tube, compared to other animal phyla, which have solid, ventral tubes. The dorsal nerve cord is later modified in vertebrates into the central nervous system which is composed of the brain and spinal cord. Dorsal nerve cord is mainly found in subphylum Vertebrata.

Bipedalism dorsal is the back and ventral is the front. In organisms which walk on four limbs the dorsal surface is the top (back) and the ventral surface is the bottom (belly).

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