| AICA | anterior inferior cerebellar artery; anterior inferior communicating artery |
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| ALCAPA | anomalous origin of left coronary artery from pulmonary artery |
| BA | Bachelor of Arts; backache; bacterial agglutination; basilar artery; basion; benzyladenine; best amp... |
| BAM | basilar artery migraine; bilateral augmentation mammoplasty; brachial artery mean [pressure]; |
| CA | anterior commissure [Lat. commissura anterior]; calcium antagonist; California [rabbit]; cancer; Can... |
| internal energy | <chemistry> A property of a system that can be changed by a flow of work, heat or both, it is represented by the symbol E (E represents the change in internal energy of a system) and is given in units of energy (Joules). (09 Jan 1998) |
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| internal-external control | A general principle that man's attempts to control his personal environment are influenced by internal or external factors. (12 Dec 1998) |
| internal female genital organs | The internal feminine genital organs, the ovaries, uterine tubes, uterus, and vagina. Synonym: organa genitalia feminina interna. (05 Mar 2000) |
| internal fistula | A fistula between hollow viscera. (05 Mar 2000) |
| internal fixation | The use of internal metal plates, screws or rods to stabilise bone fragments. A procedure used to correct serious orthopaedic bone fractures that cannot be stabilised by casting or splinting. See: external fixation. (27 Sep 1997) |
| internal fixators | Internal devices used in osteosynthesis to hold the position of the fracture in proper alignment. By applying the principles of biomedical engineering, the surgeon uses metal plates, nails, rods, etc., for the correction of skeletal defects. (12 Dec 1998) |
| internal haemorrhage | Bleeding into organs or cavities of the body. Synonym: concealed haemorrhage. (05 Mar 2000) |
| internal haemorrhoids | Dilated veins beneath the mucous membrane within the sphincter. (05 Mar 2000) |
| internal hernia | Protrusion of an intraperitoneal viscus into a compartment within the abdominal cavity. (05 Mar 2000) |
| internal hydrocephalus | Hydrocephalus in which the accumulation of fluid is confined to the ventricles; also occurs as an autosomal recessive condition in the Hereford and Holstein breeds of cattle. (05 Mar 2000) |
| internal inguinal ring | The opening in the transversalis fascia through which the ductus deferens (or round ligament in the female) and gonadal vessels enter the inguinal canal. Located midway between anterior superior iliac spine and pubic tubercle, it is bounded medially by the lateral umbilical ligament (inferior epigastric vessels) and inferiorly by the inguinal ligament. Indirect inguinal hernias exit the abdominal cavity via the deep inguinal ring Synonym: annulus inguinalis profundus, abdominal ring, annulus abdominalis, internal inguinal ring. (05 Mar 2000) |
| internal intercostal membrane | The membrane that replaces the internal intercostal muscle posteriorly, medial to the angles of the ribs. Synonym: membrana intercostalis interna. (05 Mar 2000) |
| internal intercostal muscle | <anatomy> Each arises from lower border of rib and passes obliquely downward and backward to be inserted into upper border of rib below; action, contract during expiration, also maintain tension in the intercostal spaces to resist mediolateral movement; nerve supply, intercostal. Synonym: musculus intercostalis internus. (05 Mar 2000) |
| internal jugular vein | <anatomy, vein> Main venouus structure of the neck, formed as a continuation of the sigmoid sinus of the dura mater, contained within the carotid sheath as it descends the neck uniting, behind the sternoclavicular joint, with the subclavian vein to form the brachiocephalic vein. Synonym: vena jugularis interna. (05 Mar 2000) |
| internal lacrimal fistula | A fistulous communication between the lacrimal sac and the ethmoidal sinus. Synonym: internal lacrimal fistula. (05 Mar 2000) |