| Th | Symbol for thorium. (05 Mar 2000) |
|---|---|
| th1 cells | Subset of helper-inducer T-lymphocytes which synthesise and secrete interleukin-2, gamma-interferon, and interleukin-12. Due to their ability to kill antigen-presenting cells and their lymphokine-mediated effector activity, th1 cells are associated with vigorous delayed-type hypersensitivity reactions. (12 Dec 1998) |
| th1 response | <immunology> An acquired immune response whose most prominent feature is high cytotoxic T lymphocyte activity relative to the amount of antibody production. The Th1 response is promoted by CD4+ Th1 T-helper cells. See: Th2 Response. (09 Oct 1997) |
| th2 cells | Subset of helper-inducer T-lymphocytes which synthesise and secrete the interleukins il-4, il-5, il-6, and il-10. These cytokines influence B-cell development and antibody production as well as augmenting humoral responses. (12 Dec 1998) |
| th2 response | <immunology> An acquired immune response whose most prominent feature is high antibody production relative to the amount of cytotoxic T lymphocyte activity The Th2 response is promoted by CD4+ Th2 T-helper cells. See: TO Response. (09 Oct 1997) |
| Thal procedure | Correction of a benign stricturing of the lower oesophagus in which the narrowed area is opened to full-thickness longitudinally and the adjacent external gastric wall is patch sutured over this defect to restore luminal circumference and continuity. (05 Mar 2000) |
| Thal, Alan | <person> U.S. Surgeon, *1925. See: Thal procedure. (05 Mar 2000) |
| thalam- | See: thalamo-. (05 Mar 2000) |
| thalamectomy | See: chemothalamectomy. Origin: thalamus + G. Ektome, excision (05 Mar 2000) |
| thalamencephalic | Relating to the thalamencephalon. (05 Mar 2000) |
| thalamencephalon | <anatomy> The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain. Origin: NL. See Thalamus, and Encephalon. Source: Websters Dictionary (01 Mar 1998) |
| thalamic | <anatomy> Of or pertaining to a thalamus or to thalami. Source: Websters Dictionary (01 Mar 1998) |
| thalamic fasciculus | Nerve fibres forming a composite bundle containing cerebellothalamic (crossed) and pallidothalamic (uncrossed) fibres that is insinuated between the thalamus and zona incerta. See: fields of Forel. Synonym: fasciculus thalamicus. (05 Mar 2000) |
| thalamic gustatory nucleus | The small ventral region of the ventral posteromedial nucleus of thalamus in which the fibres of the gustatory lemniscus and secondary trigeminal tracts terminate; it projects to the lower part of the postcentral gyrus of the cerebral cortex. Synonym: arcuate nucleus, nucleus arcuatus thalami, nucleus arcuatus, semilunar nucleus of Flechsig, thalamic gustatory nucleus. (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) |