tuber A lump or bump. For example, the backward protrusion of the heel is called the tuber calcanei or, alternatively, the tuberosity of the calcaneus. Small tubers are a characteristic finding in tuberculosis, and tubers in the brain are seen in tuberous sclerosis.
tube A long, hollow cylinder. There are many tube-like structures in the human body, such as the Eustachean tube in the ear. For specific types of tubes, see their alphabetical listing.
tubal ligation A form of surgical sterilization performed as a contraceptive option in women who never want to become pregnant in the future. It is considered permanent because reversal requires major surgery. The procedure blocks the fallopian tubes by various surgical techniques, usually under general anesthesia.
TTP Thrombotic thrombocytopenic purpura.
Tsutsugamushi disease See typhus, scrub.
T-suppressor count A test that counts the number of T-suppressor (T-8) cells in the bloodstream. See also helper/suppressor ratio; T-suppressor cell.
T-suppressor cell A T cell that expresses the CD8 transmembrane glycoprotein (CD8+ T cells). T-suppressor cells close down the immune response after invading organisms are destroyed. Tsuppressor cells are sensitive to high concentrations of circulating lymphokine hormones, and they release their own lymphokines after an immune response has achieved its goal. This signals all other…
TSI Thyroid stimulating immunoglobulin.
TSH Thyroid stimulating hormone.
trypanosomiasis, American See Chagas disease.
Trypanosoma cruzi The microorganism that causes Chagas disease. See also Chagas disease.
trunk bones See bones of the trunk.