thalamus

partly from the red nucleus of the tegmentum, pa ing some through the internal capsule and some through the lenticular nucleus, and terminating in the cortex of the parietal lobe. r. thalam'ica, thalamic radiation, the fibers pa ing out from the surface of the thalamus and running through the internal capsule to reach the cerebral cortex, called also thalamocortical tract and thalamic peduncles. of diverging in all directions from a center. z. The sending forth of light or any other rays. 3; cerebral tract or diverging bundle of white fibers in the brain, see radiatio. 4. A ray. a group of atoms pa ing as such from one compound to another, acting thus like a single atom. 2. The haptophore group of an antibody. 3. Relating to the root or cause, thorough; as a radical operation, one which removes every trace of po ibly diseased ti ue, or makes recurrence impo ible. ±. rootlet or structure resembling one, as the radicle of a vein, a minute veinlet joining with others to form a vein; or the radicle of a nerve, a nerve fiber which joins others to form n nerve 2. Radical (i and 2). root, G. tome, section.] Rhizotomy, A + sensory root of a spinal nerve. excision.] Excision of the posterior root of I spinal nerve. + root.