Nervure

(ner'-vur). In biology, one of the veins or nerves of a leaf or an insect's "ting its exit through an intervertebral foramen, iere are 31 pairs of spinal nerves. N. -storm, a iidden outburst or paroxysm of neurotic disturbance. N. -stretching, mechanical elongation or tension of a nerve, for neuralgia, spasmodic contraction, and other i pathologic conditions. N. -substance, the substance 1 of a nerve-cell. N., Sympathetic, one of a sys i tern of nerves distributed chiefly to the blood-ve els and to the viscera. They are so-called because they were thought to establish a communication or sympathy between distant organs of the body, especially in diseased states. See Sympathetic. N., Thermic. A synonym of Ar., Calorific. N.-tire, neurasthenia. N. -ti ue, the intrinsic substance of a nerve or nerve i fiber. N. -track, same as N.-path. N., Trophic, a nerve, the function of which is to preside over the nutrition of the part to which it is distributed. N.trunk, the main division or stem of a nerve. N.-tube, a nerve-fiber; also a hollow cord of embryonic nervous ti ue. N. -tuft, a minute plexus of nerve-fibers. N.tumor. See Neuroma and Tumors, Table of. N.tunic, an investiture by nervous ti ue. N.-twig, a minute ramification of a nerve. N., Ulnar Collateral. See N., Krauses. N., Vaso-constrictor. See N.. Vaso-motor. N., Vaso-dilator. See N., Vasomotor. N., Vaso-hypertonic. A synonym of A'., -constrictor. N.,Vaso-inhibitory. A synonym of A", Vaso-dilator. N., Vaso-motor; vasomotor nerves are of two kinds those, stimulation of which causes contraction of the ve els, vaso-constrictor nfrves.' those, stimulation of which causes active dilatation, vaso-dilator nerves. Ordinarily vaso-motor B -ynonymous with vaso-constrictor. N.-wave, a wave-motion in a nerve. Nerved (nervd). Having nerves; nervose; innervated.