THALAMUS

(Lat.), n. m. Tha2l(tha3l)'a2m(a'm)-u3s(u<s). Gr., 0dAc/uos. Fr., thalaine. Ger., T. 1. See Optic t. 2. In botany, a receptacle; of some authors, a calyx, [a, 35.] Optic t. Fr., couche optique. Ger., Sehhiigel. An oval, grayish ma seen on the floor of the lateral ventricle, after removing the fornix and velum inter pos i tum. It is bounded anteriorly and externally by the corresponding corpus stria turn, from which it is separated by the taenia semicircular is. To its inner side lies the third ventricle, of which it forms the lateral wall. Its lower surface forms the covering of the descending cornu of the lateral ventricle. Posteriorly it ends in two rounded ma es, the geniculate bodies. The optic t. consists e entially of gray matter, with a thin external covering of white. In its interior are several distinct ganglionic ma es or nuclei. [I, 15 (K).] Cf- Median CENTRE of Luys.T. corporum caver no so rum. See CRUS penis. T'fasern der Haube. Certain nerve-fibres of the tegmentum which enter the optic thalamus. [1, 17 (K).] T. fructification is. Ger., Befruchtung tuhl. 1. The torus of a flower. 2. The hymenium of fungi. 3. The hypothecium of lichens, [a, 35.] T. nervi optic i (seu opticorum). T. optic us. See Optic t. T. regal is. See PERICARDIUM. T'wurzel des Tractus optic us (Ger.). Those fibres of the optic tract which may be traced directly to the optic t. [I, 6 (K).] THALAMUSSTIEL, (Ger.), n. Ta3l'a3m-us-stel. The reflected portion of the anterior pillar of the fornix, which turns upward from the corpora albicantia to enter the corresponding optic thalamus. [I, 17 (K).] Unterer T. The inferior peduncle of the optic thalamus. [I, 10 (K).] Vorderer T. The anterior peduncle of the optic thalamus. [1, 10 (K).] [s. 612]