| AICA | anterior inferior cerebellar artery; anterior inferior communicating artery |
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| PICA | percutaneous transluminal coronary angioplasty; Porch Index of Communicative Abilities; posterior in... |
| ITA | inferior temporal artery; internal thoracic artery; International Tuberculosis Association |
| TIVC | thoracic inferior vena cava |
| TDF | testis-determining factor; thoracic duct fistula; thoracic duct flow; time-dose fractionation; tissu... |
| cathodal opening tetanus | An obsolete term for a tonic contraction in a muscle, to which the cathode is applied; when the circuit is opened, the contraction is suddenly interrupted. (05 Mar 2000) |
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| Ritter's opening tetanus | The tetanic contraction that occasionally occurs when a strong current, passing through a long stretch of nerve, is suddenly interrupted. (05 Mar 2000) |
| pharyngeal opening of auditory tube | An opening in the upper part of the nasopharynx about 1.2 cm behind the posterior extremity of the inferior concha on each side. Synonym: ostium pharyngeum tubae auditivae, pharyngeal opening of eustachian tube. (05 Mar 2000) |
| pharyngeal opening of eustachian tube | An opening in the upper part of the nasopharynx about 1.2 cm behind the posterior extremity of the inferior concha on each side. Synonym: ostium pharyngeum tubae auditivae, pharyngeal opening of eustachian tube. (05 Mar 2000) |
| piriform opening | The anterior nasal opening in the skull. Synonym: apertura piriformis, piriform opening. (05 Mar 2000) |
| cornua of falciform margin of saphenous opening | See: inferior horn of falciform margin of saphenous opening, superior horn of falciform margin of saphenous opening. (05 Mar 2000) |
| crest of cochlear opening | The edge of the opening of the cochlear window to which the secondary tympanic membrane is attached. Synonym: crista fenestrae cochleae, crest of cochlear opening. (05 Mar 2000) |
| saphenous opening | The opening in the fascia lata inferior to the medial part of the inguinal ligament through which the saphenous vein passes to enter the femoral vein. Synonym: hiatus saphenus, fossa ovalis, saphenous hiatus. (05 Mar 2000) |
| horns of saphenous opening | See: inferior horn of falciform margin of saphenous opening, superior horn of falciform margin of saphenous opening. (05 Mar 2000) |
| superior horn of falciform margin of saphenous opening | The upper part of the falciform margin of the opening in the fascia lata through which the greater saphenous vein passes. Synonym: cornu superius marginalis falciformis, Burns' falciform process, Burns' ligament, Hey's ligament. (05 Mar 2000) |
| ileocaecal opening | 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) |
| intercartilaginous part of glottic opening | The opening between the vocal processes of the arytenoid cartilages. Synonym: pars intercartilaginea rimae glottidis, glottis respiratoria, intercartilaginous part of glottic opening. (05 Mar 2000) |
| intermembranous part of glottic opening | The portion of the opening anterior to the vocal processes of the arytenoid cartilages bounded by the vocal ligaments. Synonym: pars intermembranacea rimae glottidis, glottis vocalis, intermembranous part of glottic opening. (05 Mar 2000) |
| internal urethral opening | 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) |
| oesophageal opening | The opening in the right crus of the diaphragm, between the central tendon and the hiatus aorticus, through which pass the oesophagus and the two vagus nerves. Synonym: hiatus oesophageus, oesophageal opening. (05 Mar 2000) |