BRAIN n.
is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three segments, the fore-, mid-, and hind-brain.
CONDUIT n.
A pipe, canal, channel, or passage for conveying water or fluid. All the conduits of my blood froze up. Shak. This is the fountain of all those bitter waters, of which, through a hundred different conduits, we have drunk. Burke.