Appendix epididymis
Appendix epididymis: A small cystic projection from the surface of the epididymis (a structure within the scrotum that is attached to the backside of the testis), which represents a remnant of the embryologic mesonephros.
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- Appendix epiploica
Appendix epiploica: A finger-like projection of fat attached to the colon.
- Appendix testis
Appendix testis: A small solid projection of tissue on the outer surface of the testis, which is a remnant of the embryologic mullerian duct.
- Apposition
Apposition: The word “apposition” has several senses including the act of adding or accretion and also the putting of things in juxtaposition, or side by side. Growth by apposition is a mode of growth that is characteristic of many tissues in the body by which nutritive matter from the blood is transformed on the surface […]
- Approved drug
Approved drug: A medication approved for marketing. In the US, the Food and Drug Administration (FDA) must approve a substance as a drug before it can be marketed. The approval process involves several steps including pre-clinical laboratory and animal studies, clinical trials for safety and efficacy, filing of a New Drug Application by the manufacturer […]
- Apraxia
Apraxia: The inability to execute a voluntary motor movement despite being able to demonstrate normal muscle function. Apraxia is not related to a lack of understanding or to any kind of physical paralysis; rather, it is caused by a problem in the cortex of the brain.