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Attention deficit/hyperactivity disorder (ADHD)
Symptoms of inattention, impulsiveness and hyperactivity. A childhood-onset neurodevelopmental disorder characterized by developmentally inappropriate…
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Atrophy
Refers to shrinkage in cell size or loss of cell substance. An adaptive response…
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Atrophie blanche
1762 Presents as painful purpuric papules that evolve into ulcerations and angular scars on…
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Atrium
Sometimes called auricle. Refers to a chamber in which blood enters the heart, as…
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Atrioventricular node (AV node)
1986 Consists of atrial muscle cells, stellate P cells, and transitional cells in a…
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