| upper lobe of lung | The lobe of the right lung that lies above the oblique and horizontal fissures and includes the apical, posterior and anterior bronchopulmonary segments; in the left lung, the lobe lies above the oblique fissure and contains the apicoposterior, anterior, superior lingular and inferior lingular segments. Synonym: lobus superior pulmonis, upper lobe of lung. (05 Mar 2000) |
|---|---|
| upper/lower lobe predominance | <radiology> Upper lobe, usually site of greatest disease due to poorer clearance, bronchogenic carcinoma, pneumoconioses, histiocytosis X, sarcoidosis, ankylosing spondylitis, lower lobe, scleroderma (12 Dec 1998) |
| anal orifice | <anatomy> The distal or terminal orifice of the alimentary canal. (18 Nov 1997) |
| aortic orifice | The opening from the left ventricle into the ascending aorta; it is guarded by the aortic valve. Synonym: ostium aortae, aortic ostium. (05 Mar 2000) |
| cardiac orifice | The trumpet-shaped opening of the oesophagus into the stomach. Synonym: ostium cardiacum, cardiac opening, oesophagogastric orifice. (05 Mar 2000) |
| vaginal orifice | The narrowest portion of the canal, in the floor of the vestibule posterior to the urethral orifice. Synonym: ostium vaginae, orificium vaginae, vaginal opening. (05 Mar 2000) |
| gastroduodenal orifice | The opening between the stomach and the superior part of the duodenum. Synonym: ostium pyloricum, gastroduodenal orifice. (05 Mar 2000) |
| golf-hole ureteral orifice | A retracted funnel-shaped condition of the ureteral orifice in the wall of the bladder, due often to tuberculosis or a secondary sclerosis of the ureter. (05 Mar 2000) |
| root canal orifice | An opening in the pulp chamber leading to the root canal. (05 Mar 2000) |
| mitral orifice | An atrioventricular opening which leads from the left atrium into the left ventricle of the heart. Synonym: ostium atrioventriculare sinistrum, ostium arteriosum. (05 Mar 2000) |
| pulmonary orifice | The opening of the pulmonary trunk from the right ventricle, guarded by the pulmonary valve. Synonym: ostium trunci pulmonalis, pulmonary orifice. (05 Mar 2000) |
| pyloric orifice | The opening between the stomach and the superior part of the duodenum. Synonym: ostium pyloricum, gastroduodenal orifice. (05 Mar 2000) |
| ileocaecal orifice | The opening of the terminal ileum into the large intestine at the transition between the caecum and the ascending colon. Synonym: ostium ileocaecale, ileocaecal opening. (05 Mar 2000) |
| internal urethral orifice | The internal opening or orifice of the urethra, at the anterior and inferior angle of the trigone. Synonym: ostium urethrae internum, internal urethral opening. (05 Mar 2000) |
| oesophagogastric orifice | The trumpet-shaped opening of the oesophagus into the stomach. Synonym: ostium cardiacum, cardiac opening, oesophagogastric orifice. (05 Mar 2000) |