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 into the brain and spinal cord. Dorsal nerve cord is mainly found in subphylum Vertebrata.
Dorsal means the "back" side, as opposed to the belly side (ventral).
Famous quotes containing the words nerve and/or cord:
“our nerve filaments twitch with its presence
day and night,
nothing we say has not the husky phlegm of it in the saying,
nothing we do has the quickness, the sureness,
the deep intelligence living at peace would have.”
—Denise Levertov (b. 1923)
“Ah! How neatly tied, in these people, is the umbilical cord of morality! Since they left their mothers they have never sinned, have they? They are apostles, they are the descendants of priests; one can only wonder from what source they draw their indignation, and above all how much they have pocketed to do this, and in any case what it has done for them.”
—Antonin Artaud (1896–1948)