nerve tube (nervtub)

11. A nerve-fiber. Hoblyn.-2. A hollow cord of nervous or embryonic nervous ti ue, as the spinal cord of a vertebrate embryo. The Craniates' ancestor had a dorsal median nerve, which has increased in size and importance so as to become the nerve- tube of existing forms. Encyc . Brit ., XXIV. 183. nerve-tuft (nėrv'tuft), n. A minute plexus or network of nerve-fibers. Beale , Protoplasm, p. 267. nerve-tunic (nėrv'tū"nik), n. An investiture by nerves or nervous ti ue; a plexus or ramified set of nerves inclosing the body or any part of it. An elongate animal, with a plexiform nerve -tunic. Encyc. Brit., XXIV. 184.