| apical process | The dendritic process extending from the apex of a pyramidal cell of the cerebral cortex toward the surface. Synonym: apical dendrite. (05 Mar 2000) |
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| apical segment | Apical segment of the superior lobe of the right lung, apical segment of the inferior lobe of the right and left lungs. Synonym: segmentum superius. Synonym: segmentum superius, segmentum apicale, superior segment. (05 Mar 2000) |
| apical space | The space between the alveolar wall and the apex of the root of a tooth where an alveolar abscess usually has its origin. (05 Mar 2000) |
| late apical systolic murmur | A murmur previously considered benign, or even extracardiac, with a possible relationship to pericardial disease; it often represents mitral insufficiency, often localised and of moderate severity but with propensity for developing bacterial endocarditis, and is frequently associated with systolic click and mitral prolapse (Barlow syndrome; a balloon or billowing mitral valve leaflet) often producing a click, murmur, or both, as it prolapses during systole into the left atrium. (05 Mar 2000) |