| nuclei terminationis | Tetracyclic steroid nucleus, the group of four fused rings forming the framework or parent substance of the steroids. Synonym: perhydrocyclopenta[a]phenanthrene, steroid nucleus, terminal nuclei. (05 Mar 2000) |
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| nuclei tuberales | Two or three small, encapsulated, round or ovoid clusters of cells in the lateral hypothalamic area along the surface of the tuber cinereum; their connections and functional significance are unknown. Synonym: nuclei tuberales, lateral tuberal nuclei. (05 Mar 2000) |
| dorsal accessory olivary nucleus | A detached part of the olivary nucleus dorsal to the latter's main body. Synonym: nucleus olivaris accessorius dorsalis. (05 Mar 2000) |
| droplet nuclei | Particles 1-10 um in diameter, implicated in spread of airborne infection; the dried residue formed by evaporation of droplets coughed or sneezed into the atmosphere or by aerosolization of infective material. (05 Mar 2000) |
| inferior accessory fissure | The fissure that commonly separates the medial basal segment of the right lower lobe of the lung from the other basal segments, seen as an oblique line near the right heart border on chest radiographs. (05 Mar 2000) |
| internal branch of accessory nerve | <anatomy, nerve> Branch of the accessory nerve trunk which carries fibres from the cranial root and which unites with the vagus nerve in the jugular foramen. See: accessory nerve. Synonym: ramus internus nervi accessorii, internal ramus of accessory nerve. (05 Mar 2000) |
| internal ramus of accessory nerve | <anatomy, nerve> Branch of the accessory nerve trunk which carries fibres from the cranial root and which unites with the vagus nerve in the jugular foramen. See: accessory nerve. Synonym: ramus internus nervi accessorii, internal ramus of accessory nerve. (05 Mar 2000) |
| intralaminar nuclei of thalamus | Collective term denoting several cell groups embedded in the internal medullary lamina of the thalamus: central lateral nucleus, paracentral nucleus, and farthest caudally, the large centromedian nucleus. The first two of these receive afferents from the cerebral cortex, brainstem, reticular formation, cerebellum, and spinal cord, and project more or less diffusely to large regions of the frontal and parietal cortex. See: centromedian nucleus. Synonym: nuclei intralaminares thalami. (05 Mar 2000) |
| tegmental nuclei | Collective term for two small round cell groups in the caudal part of the midbrain (caudal pontine tegmental nucleus, nucleus tegmenti pontis caudalis and oral pontine tegmental nucleus, nucleus tegmenti pontis oralis), associated with the mamillary body by way of the mamillary peduncle and mamillotegmental tract. Synonym: nuclei tegmenti, Gudden's tegmental nuclei. (05 Mar 2000) |
| terminal nuclei | Nuclei terminales, collective term indicating those nerve cell groups in the rhombencephalon and spinal cord in which the afferent fibres of the spinal and cranial nerves terminate. Synonym: nuclei terminationis, secondary sensory nuclei. (05 Mar 2000) |
| thalamic nuclei | Several groups of nuclei in the thalamus that serve as the major relay centres for sensory impulses in the brain. (12 Dec 1998) |
| trigeminal nuclei | Nuclei of the trigeminal nerve situated in the brainstem. They include the nucleus of the spinal trigeminal tract (trigeminal nucleus, spinal), the principal sensory nucleus, the mesencephalic nucleus, and the motor nucleus. (12 Dec 1998) |
| tuberal nuclei | Two or three small, encapsulated, round or ovoid clusters of cells in the lateral hypothalamic area along the surface of the tuber cinereum; their connections and functional significance are unknown. Synonym: nuclei tuberales, lateral tuberal nuclei. (05 Mar 2000) |
| tuberculum nuclei cuneati | tubercle of cuneate nucleus |
| tuberculum nuclei gracilis | tubercle of gracile nucleus |