Category: T

One of the branches into which the axon of a neuron divides at its destination. Each telodendron finishes as a terminal bouton, which takes part in a synapse or a neuromuscular junction.  

A chromosome in which the centromere is situated at either of its ends. Location of the centromere in the extreme end of the replicating chromosome so that there is only one arm on the chromosome.  

A form of radiotherapy in which penetrating radiation is directed at a patient from a distance. Originally radium was used as the radiation source; today artificial radioactive isotopes, such as cobalt-60, are used.  

Inflammation of the smallest blood vessels.  

Shimmering colored lights, accompanied by blank spots in the visual field {transient scotomata), often seen by sufferers at the beginning of an attack of migraine. Zigzag lines (called fortification spectra) that patients with migraine often experience as a visual aura preceding an attack. A visual disruption characterized by the presence of flickering, zigzagging patterns of…

The roof of the midbrain, behind and above the ‘cerebral aqueduct. From the nerve tissue protrude two pairs of rounded swellings called the superior and inferior colliculi, which contain cells concerned with reflexes involving vision and hearing, respectively. Any structure serving as, or resembling, a roof. A structure resembling a roof.  

Any of the several kinds of gas used in warfare and by the police to produce temporary incapacitation. Most tear gases produce stinging pain in the eyes and streaming from the eyes and nose.  

A recording drum consisting of an elastic membrane stretched over one end of a cylinder. It is used in various instruments for recording changes in air pressure. A shallow, drum-shaped appliance used in registering information such as changes in rate or intensity of pulse, respiration, or arterial blood pressure.  

A procedure used to open a fallopian tube blocked by scarring or narrowing, often where the blockage has prevented conception. In this procedure, a thin, flexible, balloon-tipped tube called a cannula is inserted into the blocked fallopian tube near its opening into the uterus. The procedure may be performed by using laparo-scopy or hysteroscopy.  

An abnormal growth arising from the trophoblast, the outer cell layer of a fertilized egg that develops into the placenta, which is the source of nutrition for the fetus. Trophoblastic tumors are curable with chemotherapy, even after they have metastasized or spread.