| LUSB | left upper scapular border; left upper sternal border |
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| UA | absorption unsharpness; ultra-audible; ultrasonic arteriography; umbilical artery; unauthorized abse... |
| UE | uncertain etiology; under elbow; uninvolved epidermis; upper esophagus; upper extremity |
| URI | uniform resource identifier; upper respiratory illness; upper respiratory infection |
| US | screen unsharpness ultrasonic, ultrasound; ultrasonography; unconditioned stimulus; unique sequence;... |
| lower segment cesarian section | A Cesarian section in which the surgical incision (cut) is made in the lower segment of the uterus. (12 Dec 1998) |
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| Lower's ring | One of four fibrous rings that surround atrioventricular and arterial orifices of the heart, providing attachment for the valve leaflets and maintaining patency of the orifice. As part of the fibrous skeleton of the heart, the fibrous rings also provide origin and insertion for the myocardium. Synonym: annulus fibrosus cordis, annulus fibrosus, coronary tendon, fibrous ring, Lower's ring. (05 Mar 2000) |
| Lower's tubercle | The slight projection on the wall of the right atrium between the orifices of the venae cavae. Synonym: tuberculum intervenosum, Lower's tubercle. (05 Mar 2000) |
| lower uterine segment | The inferior portion or isthmus of the uterus, the lower extremity of which joins with the cervical canal and, during pregnancy, expands to become the lower part of the uterine cavity. (05 Mar 2000) |
| lower uterine segment cesarean section | A cesarean section in which the uterus is entered in its lower segment by a transperitoneal approach. (05 Mar 2000) |
| alpha cells of anterior lobe of hypophysis | Acidophil cell's that constitute about 35% of the cell's of the anterior lobe. There are two varieties: one that elaborates somatotropin, another that elaborates prolactin. (05 Mar 2000) |
| anterior lobe of hypophysis | An alternate term for adenohypophysis. (05 Mar 2000) |
| artery of caudate lobe | Origin, left branch of proper hepatic; distribution, caudate lobe of the liver. Synonym: arteria lobi caudati. (05 Mar 2000) |
| azygos lobe of lung | A small accessory lobe sometimes found on the apex of the right lung; separated from the rest of the upper lobe by a deep groove lodging the azygos vein. Synonym: lobus azygos. (05 Mar 2000) |
| azygos pseudo-lobe | <radiology> Not a true lobe, does not have separate broncus or vasculature, due to invagination of azygos vein into RUL, no clinical significance (12 Dec 1998) |
| basophil cell of anterior lobe of hypophysis | beta cell of anterior lobe of hypophysis |
| parietal lobe | Part of the brain and specifically a section of thecerebral hemisphere. (12 Dec 1998) |
| parietal lobe epilepsy | A localization-related epilepsy where seizures originate within the parietal lobe. Seizure semiology may involve abnormalities of sensation. (05 Mar 2000) |
| parietal lobe of cerebrum | The middle portion of each cerebral hemisphere, separated from the frontal lobe by the central sulcus, from the temporal lobe by the lateral sulcus in front and an imaginary line projected posteriorly, and from the occipital lobe only partially by the parieto-occipital sulcus on its medial aspect. Synonym: lobus parietalis cerebri, parietal lobe. (05 Mar 2000) |
| caudate lobe | A small lobe of the liver situated posteriorly between the sulcus for the vena cava and the fissure for the ligamentum venosum. Synonym: caudate lobe, Spigelius' lobe. Lobi cerebri, the major divisions of the cerebral hemisphere; they include the frontal, parietal, temporal, and occipital lobes, named for the overlying bones of the skull. Synonym: lobes of cerebrum. Lobus clivi, the clivus monticuli and the posterior crescentic lobules of the cerebellum considered as one lobe. (05 Mar 2000) |