Category: T

  • Tubule

    A series of compartmentalized, small tubes that collect or transport substances in bodily organs. A small tube. There are several named tubules in the body: examples include convoluted tubules in the nephron of the kidney and the seminiferous tubules in the testes. An extremely minute, tube-like structure found in the nephron of the kidney, responsible…

  • Truncus arteriosus

    Heart malformation in which a single large vessel empties both ventricles, causing cyanosis to develop soon after birth with severe congestive heart failure, dyspnea, retractions, fatigue, polycythemia, clubbing, increased pulse pressure, bounding peripheral pulses, and cardiomegaly. The main arterial trunk arising from the fetal heart. It develops into the aorta and pulmonary artery.  

  • Tricuspid atresia

    Congenital absence of the tricuspid valve of the heart.  

  • Triceps brachii muscle

    Muscle on the dorsal surface of the humerus that extends the forearm when flexed.  

  • Trendelenburg position

    Placement of a patient lying flat in bed with the head lowered and the feet elevated to enhance blood flow to the brain and vital organs. A special operating-table posture for patients undergoing surgery of the pelvis or for patients suffering from shock. The patient is laid on his back with the pelvis higher than…

  • Trapezius muscle

    A flat, triangular muscle of the posterior shoulder and neck that shrugs the shoulder when flexed. A substantial muscle with a diamond shape, stretching from the rear of the skull down to the lower spine within the chest region and spanning across the breadth of the shoulders. The trapezius muscle connects to the upper and…

  • Transversus abdominis muscle

    Muscle that compresses the abdomen and aids in posture.  

  • Transposition of the great arteries

    Condition where the pulmonary artery is the outflow for left ventricle, and the aorta is the outflow for right ventricle; life- threatening at birth, and survival initially depends on open ducts of arteriosus and foramen ovale; this condition occurs in about 5 percent of children with congenital heart disease.  

  • Transmyocardial revascularization

    Abbreviated TMR, use of a laser to open small channels in the heart muscle to restore blood flow in patients with angina associated with advanced coronary artery disease. This procedure is used when other surgical interventions are not viable. The use of a laser to bore tiny channels directly through the wall of the heart…

  • Transesophageal echocardiography

    Examination of the heart using an endoscope and sonographic transducer inserted in the esophagus directly behind the heart. An invasive technique for obtaining echocardiographic images in which the ultrasonographic transducer is introduced into the esophagus. TEE is useful in detecting cardiac sources of emboli, prosthetic heart valve malfunction, endocarditis, aortic dissection, cardiac tumors, and valvular…