| atretic ovarian follicle | A follicle that degenerates before coming to maturity; great numbers of such atretic follicle's occur in the ovary before puberty; in the sexually mature woman, several are formed each month. Synonym: corpus atreticum. (05 Mar 2000) |
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| atreto- | Lack of an opening. Origin: G. Atretos, imperforate fr. A-, not + tretos, perforated, fr. Tetraino, titremi, to bore through, to pierce. (05 Mar 2000) |
| atretoblepharia | Synonym: symblepharon. Origin: atreto-+ G. Blepharon, eyelid (05 Mar 2000) |
| atretocystia | Congenital or acquired absence of an opening of a bladder. Origin: atreto-+ G. Kystis, bladder (05 Mar 2000) |
| atretogastria | Congenital absence of an opening of the stomach. Origin: atreto-+ G. Gaster, stomach (05 Mar 2000) |
| atretopsia | Synonym: atresia iridis. Origin: atreto-+ G. Ops, eye (05 Mar 2000) |
| atria | <anatomy, cardiology> The thin-walled chambers of the heart that pump blood into the ventricles. Consists of right atrium and left atrium. (27 Sep 1997) |
| atrial | <anatomy> Pertaining to an atrium. (16 Dec 1997) |
| atrial appendage | The small projection from each atrium hanging over like a small ear, more marked on the left, with a small cavity of its own. (05 Mar 2000) |
| atrial arrhythmias | See Arrhythmias, atrial. (12 Dec 1998) |
| atrial arteries | Branches of the right and left coronary arteries distributed to the muscle of the atria. Synonym: arteriae atriales. (05 Mar 2000) |
| atrial auricle | The auricle of atrium. See: left atrium, right atrium. (05 Mar 2000) |
| atrial auricula | A small conical ("ear-shaped") pouch projecting from the upper anterior portion of each atrium of the heart, increasing slightly the atrial volume. See: auricle of left atrium, auricle of right atrium. Synonym: auricula atrialis, atrial auricle, atrial auricula, auricle, auricula, auricular appendage, auricular appendix, skin tag. (05 Mar 2000) |
| atrial bigeminy | Pairing of atrial beats, as when an atrial extrasystole is coupled to each sinus beat. (05 Mar 2000) |
| atrial branches | The atrial branches, the branches of the right coronary artery and the circumflex branch of the left coronary artery distributed to the right and left atrium, respectively. Synonym: rami atriales. (05 Mar 2000) |