| OA | obstructive apnea; occipital artery; occipito-anterior; occiput anterior; octanoic acid; ocular albi... |
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| Sa | the most anterior point of the anterior contour of the sella turcica [point]; saline; Staphylococcus... |
| ACA | Anterior Cerebral Artery |
| A-COM | Anterior COMmunicating artery |
| AICA | Anterior Inferior Cerebellar Artery; Hemifacial Spasm |
| anterior chamber of eye | The space between the cornea anteriorly and the iris/pupil posteriorly, filled with a watery fluid (aqueous humor) and communicating through the pupil with the posterior chamber. Synonym: camera anterior bulbi, camera oculi anterior, camera oculi major. (05 Mar 2000) |
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| anterior chamber trabecula | Tissue at the angle of the anterior chamber through which aqueous humor exits from the eye. (05 Mar 2000) |
| anterior choroidal artery | <anatomy, artery> Origin, internal carotid or (rarely) middle cerebral artery; distribution, optic tract, crus cerebri, uncus, hippocampus, globus pallidus, posterior part of internal capsule, geniculate bodies of the thalamus, and choroid plexus in the inferior horn of the lateral ventricle. Synonym: arteria choroidea anterior. (05 Mar 2000) |
| anterior choroiditis | Disseminated choroiditis restricted to peripheral choroid. (05 Mar 2000) |
| anterior ciliary artery | <anatomy, artery> One of several arteries derived from muscular branches of the ophthalmic which perforate the anterior part of the sclera and anastomose with posterior ciliary arteries. Synonym: arteria ciliaris anterior. (05 Mar 2000) |
| anterior circumflex humeral artery | <anatomy, artery> Origin, axillary; distribution, shoulder joint and biceps muscle; anastomoses, posterior circumflex humeral artery. Synonym: arteria circumflexa humeri anterior, anterior humeral circumflex artery. (05 Mar 2000) |
| anterior clear space | On lateral chest radiographs, the region dorsal to the sternum and ventral to the ascending aorta. Synonym: anterior clear space. (05 Mar 2000) |
| anterior column | The pronounced, ventrally oriented ridge of gray matter in each half of the spinal cord; it corresponds to the anterior or ventral horn appearing in transverse sections of the cord, and contains the motor neurons innervating the skeletal musculature of the trunk, neck, and extremities. See: gray columns. Synonym: columna anterior. (05 Mar 2000) |
| anterior column of medulla oblongata | An elongated, white prominence on the ventral surface of the medulla oblongata on either side along the anterior median fissure, corresponding to the pyramidal tract. Synonym: pyramis medullae oblongatae, anterior column of medulla oblongata, anterior pyramid. (05 Mar 2000) |
| anterior commissure | A round bundle of nerve fibres that crosses the midline of the brain near the anterior limit of the third ventricle. It consists of a smaller anterior part, the fibres of which pass in part to the olfactory bulbs, and a larger posterior part, which interconnects the left and right temporal lobes. Synonym: commissura anterior. (05 Mar 2000) |
| anterior communicating artery | <anatomy, artery> A short vessel joining the two anterior cerebral arteries and completing the cerebral arterial circle (circle of Willis) anteriorly. Synonym: arteria communicans anterior. (05 Mar 2000) |
| anterior compartment syndrome | <syndrome> Rapid swelling, increased tension, pain, and ischemic necrosis of the muscles of the anterior tibial compartment of the leg, often following excessive exertion. (12 Dec 1998) |
| anterior component of force | A force operating to move teeth anteriorly. (05 Mar 2000) |
| anterior condyloid canal of occipital bone | The canal through which the hypoglossal nerve emerges from the skull. Synonym: canalis hypoglossalis, anterior condyloid canal of occipital bone, anterior condyloid foramen. (05 Mar 2000) |
| anterior condyloid foramen | The canal through which the hypoglossal nerve emerges from the skull. Synonym: canalis hypoglossalis, anterior condyloid canal of occipital bone, anterior condyloid foramen. (05 Mar 2000) |