| IAD | inactivating dose; instructional advance directive; internal absorbed dose |
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| IAM | Institute of Applied Microbiology [Japan]; Institute of Aviation Medicine; internal auditory meatus |
| IAS | immunosuppressive acidic substance; infant apnea syndrome; insulin autoimmune syndrome; interatrial ... |
| ICA | Institute of Clinical Analysis; internal carotid artery; intracranial aneurysm; islet cell antibody |
| ICAO | internal carotid artery occlusion |
| internal occipital protuberance | A projection from about the centre of the cruciform eminence on the inner surface of the occipital bone. Synonym: protuberantia occipitalis interna. (05 Mar 2000) |
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| internal ophthalmopathy | Any disease of the internal structures of the eyeball. (05 Mar 2000) |
| internal ophthalmoplegia | Paralysis affecting only the sphincter muscle of the pupil and the ciliary muscle. Synonym: internal ophthalmoplegia. (05 Mar 2000) |
| internal ovular transmigration | Indirect ovular transmigration when the ovum crosses the uterine cavity and so enters the tube of the opposite side. (05 Mar 2000) |
| internal phase | The particles contained in a colloid solution. Synonym: discontinuous phase, dispersed phase. (05 Mar 2000) |
| internal pterygoid muscle | <anatomy, muscle> Origin, pterygoid fossa of sphenoid and tuberosity of maxilla; insertion, medial surface of mandible between angle and mylohyoid groove; action, elevates mandible closing jaw; nerve supply, nerve to medial pterygoid from mandibular division of trigeminal. Synonym: musculus pterygoideus medialis, internal pterygoid muscle, musculus pterygoideus internus. (05 Mar 2000) |
| internal pudendal artery | <anatomy, artery> Origin, internal iliac; branches, inferior rectal, perineal, posterior scrotal (or labial), urethral, artery of bulb of penis (or of vestibule), deep artery of penis (or clitoris), dorsal artery of penis (or clitoris). Synonym: arteria pudenda interna. (05 Mar 2000) |
| internal pudendal vein | <anatomy, vein> A tributary of the internal iliac vein that accompanies the internal pudendal artery as a single or double vessel. It drains the perineum. Synonym: vena pudenda interna. (05 Mar 2000) |
| internal pyocephalus | Intraventricular suppuration. (05 Mar 2000) |
| internal radiation therapy | Radiation therapy in which radioactive material is placed in or near a tumour. (12 Dec 1998) |
| internal ramus of accessory nerve | <anatomy, nerve> Branch of the accessory nerve trunk which carries fibres from the cranial root and which unites with the vagus nerve in the jugular foramen. See: accessory nerve. Synonym: ramus internus nervi accessorii, internal ramus of accessory nerve. (05 Mar 2000) |
| internal reduction | The relocation of a joint or realignment of a fracture through a surgical incision. most internal reductions utilise general anaesthesia. (27 Sep 1997) |
| internal resorption | A loss of tooth structure originating within the pulp cavity. (05 Mar 2000) |
| internal respiration | The interchange of gases between the blood and the tissues. Synonym: internal respiration. (05 Mar 2000) |
| internal saphenous nerve | <anatomy, nerve> A branch of the femoral, extending from the femoral triangle to the foot, becoming subcutaneous on the medial side of the knee; it supplies cutaneous branches to the skin of the leg and foot, by way of infrapatellar and medial crural branches. Synonym: nervus saphenus, internal saphenous nerve, long saphenous nerve. (05 Mar 2000) |