Definitions for "Notochord"
An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebræ and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.
a stiff dorsal rod found in all chordates at some devlopmental stage; the notochord is replaced by the vertebral column in most chordates
the column of cells arising from the axial process.
Keywords:  hollow, nerves, along, tube, running
a hollow tube of nerves running along the back of the animal