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: 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: 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.
- Apraxia of speech
Apraxia of speech: A severe speech disorder characterized by inability to speak, or a severe struggle to speak clearly. Apraxia of speech occurs when the oral- motor muscles do not or cannot obey commands from the brain, or when the brain cannot reliably send those commands. Children with apraxia can be helped significantly with intensive […]
- APS (autoimmune polyglandular syndrome)
APS (autoimmune polyglandular syndrome): A genetic autoimmune disease with an extraordinary array of clinical features but characterized most often by at least 2 of the following 3 findings: hypoparathyroidism — underfunction of the parathyroid glands which control calcium, candidiasis (yeast infection), and adrenal insufficiency (underfunction of the adrenal gland). APS was the first systemic (bodywide) […]