Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «T»:
Trocar: A sharply pointed shaft, usually with a three-sided point. A trocar may be used within a cannula, a hollow tube, designed to be inserted into a vein, artery, bone marrow or body cavity. The word trocar is derived from the French "trois" (three) + "carre" (side)....
Trochanter: One of the bony prominences toward the near end of the thigh bone (the femur). There are two trochanters:
The greater trochanter: A powerful protrusion located at the proximal (near) and lateral (outside) part of the shaft of the femur;
The lesser trochanter: A pyramidal prominence pro...
Troche: A small medicated lozenge designed to dissolve. For example, to soothe the throat as a cough drop.
Strictly speaking, a troche should be circular since the word derives from the Greek "trokhiskos" meaning "a little wheel."
Pronounced trOh-key. Sometimes mistakenly pronounced trOhsh or trO...
Trochlear nerve: The trochlear nerve controls the superior oblique muscle of the eye, one of the extraocular muscles, the muscles that move the eye. Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, double vision).
The trochlear nerve is the four...
Tropical cyclone: A regionally specific name for a strong tropical cyclone in the Southwest Indian Ocean. Other terms for precisely the same type of storm include
hurricane (in the North Atlantic Ocean, the Northeast Pacific Ocean east of the dateline, or the South Pacific Ocean east of 160E),
Tropical diabetes: Diabetes mellitus associated with chronic malnutrition and, sometimes, chronic pancreatitis. Whether tropical diabetes exists as a distinct entity is under debate. While malnutrition may influence the expression of diabetes, the evidence that diabetes can be directly caused by pr...
Tropical oil: Coconut, palm kernel or palm oil. Like all fats and oils, these three oils contain various types of fatty acids but, unlike other plant oils, they contain a great deal of saturated fatty acids. Coconut oil is 92%, palm kernel oil 82% and palm oil 50% saturated fat. These oils are found...
Tropical typhus: See Typhus, scrub....
Trp:. Tryptophan. See also: Amino acid symbols....
True cramp: A cramp that involves part or all of a single muscle or group of muscles that usually act together such as, for example, the muscles that flex adjacent fingers. True cramps are caused by hyperexcitability of the nerves that stimulate the muscles. They are the most common type of muscle c...
True rib: One of the first 7 pairs of ribs. A rib is said to be "true" if it attaches to the sternum (the breast bone).
All 12 pairs of ribs attach to the building blocks of the spine (vertebrae) in the back. The 12 pairs of ribs consist of:
True ribs: The first seven ribs attach to the sternum (t...
Truncate: To shorten, to cut short. A malformation (birth defect) may truncate a limb. A mutation may create a stop codon that truncates a protein. From the Latin truncare maening to cut short or mutilate from truncus, trunk....
Truncation: The act of truncating, cutting short. See: Truncate....
Trunk bones: The bones of the human trunk, 51 bones in all, consisting of 26 vertebrae, 24 ribs and the sternum. The 26 vertebrae comprise the 7 cervical, 12 thoracic and 5 lumbar vertebrae, the sacrum and the coccyx. The 24 ribs comprise 14 true ribs, 6 false ribs and 4 floating ribs. The sternum...
Trunk, pulmonary: See: Pulmonary trunk....