| IAC | image analysis cytometry; ineffective airway clearance; internal auditory canal; interposed abdomina... |
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| IAD | inactivating dose; instructional advance directive; internal absorbed dose |
| 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 |
| internal maxillary plexus | <anatomy, artery> An autonomic plexus on the maxillary artery derived from the external carotid plexus. Synonym: internal maxillary plexus, maxillary plexus, plexus maxillaris internus. (05 Mar 2000) |
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| internal medicine | The speciality of the general medicine of the internal organs. In the Commonwealth, the specialist in internal medicine is called a Physician (in the us, an Internist). (16 Dec 1997) |
| internal medullary lamina | See: medullary laminae of thalamus. (05 Mar 2000) |
| internal membrane | General term for intracellular membrane systems such as endoplasmic reticulum. Not particularly helpful, but has the advantage of being noncommittal. (18 Nov 1997) |
| internal meningitis | Inflammation of the inner surface of the dura mater. Synonym: internal meningitis. (05 Mar 2000) |
| internal naris | An obsolete term for choana. (05 Mar 2000) |
| internal nasal branches | Branches to nasal cavity. Internal nasal branches of 1) infraorbital nerve (rami nasales interni nervi infraorbitalis ); 2) nasociliary nerve (rami nasales interni nervi ethmoidalis anterioris ). Synonym: rami nasales interni. (05 Mar 2000) |
| internal nostril | The definitive choana opening into the nasopharynx, after the nasal chambers have been lengthened by the formation of the secondary palate. Synonym: internal nostril. (05 Mar 2000) |
| internal nuclear layer of retina | The intermediate layer of neurons in the retina composed largely of bipolar cells. Synonym: internal nuclear layer of retina, stratum ganglionare retinae, stratum nucleare internum retinae. (05 Mar 2000) |
| internal oblique | <anatomy, muscle> Origin, iliac fascia deep to lateral part of inguinal ligament, anterior half of crest of ilium, and lumbar fascia; insertion, tenth to twelfth ribs and sheath of rectus; some of the fibres from inguinal ligament terminate in the conjoint tendon; action, diminishes capacity of abdomen, flexes lumbar vertebral column (bends thorax forward); nerve supply, lower thoracic. Synonym: musculus obliquus internus abdominis, abdominal internal oblique muscle. (05 Mar 2000) |
| internal oblique line | A ridge on the inner surface of the mandible running from a point inferior to the mental spine upward and backward to the ramus behind the last molar tooth; it gives attachment to the mylohyoid muscle and the lowermost part of the superior constrictor of the pharynx. Synonym: linea mylohyoidea, internal oblique line, mylohyoid ridge. (05 Mar 2000) |
| internal obturator muscle | <anatomy, muscle> Origin, pelvic surface of obturator membrane and margin of obturator foramen; insertion, passes out of pelvis through lesser sciatic foramen, in so doing, making a 90 |
| internal occipital crest | A ridge running from the internal occipital protuberance to the posterior margin of the foramen magnum, giving attachment to the falx cerebelli. Synonym: crista occipitalis interna. (05 Mar 2000) |
| 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) |
| internal ophthalmopathy | Any disease of the internal structures of the eyeball. (05 Mar 2000) |