ra'diz, gen. rad i'cis, pi. rad i'ces

[L.] i The root of a plant. 2. The primary or beginning portion of any part, as of a nerve at its origin from the brain or spinal cord. r. ante'iior [BNA], the anterior, ventral, or motor root of a spinal nerve. r. arciw ver'tebrse [BNA], root of the vertebra arch, pedicle, r. bre'vis gan'glii cilia'ris[BNA], motor root of the ciliary ganglion, short root of the ciliary ganglion, a branch of the oculomotor nerve given off in the superior orbital fi ure, i. den'tis [BNA], root of a tooth, that part below the neck, covered by cementum instead of enamel, which is fixed in the alveolus, r. dorsa'lis, r. posterior [BNA]. r. later a'lis trac'tus op'tic i [BNA], lateral root of the optic tract, one of the two roots of origin of the optic tract which comes from the lateral geniculate body and the pulvinar of the thalamus, r. lin'gus [BNA], root of the tongue, the posterior attached portion of the tongue, c. lon'ga gan'glii cilia'ris [BNA], sensory root of the ciliary ganglion, a slender, sometimes double, branch of the nasociliary nerve, arising from the first part of the nerve where it cro es the optic nerve, r. media'- optic tract, one of the two roots of origin of the optic tract which comes from the medial geniculate body. r. mesenter'ii [BNA], the origin of the mesentery of the small intestine from the posterior parietal peritoneum, r. moll'is gan'- glii cilia'ris [BNA], soft root of the ciliary gang carotid plexus which enter the posterior border of the ciliary ganglion, r. na'si [BNA], root of the nose, the upper extremity of the nose situated between the two orbits, r. ner'vi facia'lis [BNA], root of the facial nerve, fibers running from the nucleus of the facial upward to the colUculus facial is where they curve around the abducens nucleus and then pa outward, between the superior olive and sensory nucleus of the trigeminal, to the ventral surface of the lower part of the pons. r. pe'nis[BNA], root of the penis, the proximal extremity of the penis