| MCA | major coronary artery; Maternity Center Association; medical care administration; methylcholanthrene... |
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| MCAO | middle cerebral artery occlusion |
| MCAS | middle cerebral artery syndrome |
| MCAT | medical college admission test; middle cerebral artery thrombosis |
| ME | macular edema; malic enzyme; manic episode; maximum effort; median eminence; medical education; medi... |
| middle | 1. Equally distant from the extreme either of a number of things or of one thing; mean; medial; as, the middle house in a row; a middle rank or station in life; flowers of middle summer; men of middle age. 2. Intermediate; intervening. "Will, seeking good, finds many middle ends." (Sir J. Davies) Middle is sometimes used in the formation of selfexplaining compounds; as, middle-sized, middle-witted. Middle Ages, the period of time intervening between the decline of the Roman Empire and the revival of letters. Hallam regards it as beginning with the sixth and ending with the fifteenth century. Middle class, in England, people who have an intermediate position between the aristocracy and the artisan class. It includes professional men, bankers, merchants, and small landed proprietors "The middle-class electorate of Great Britain." (M. Arnold) Middle distance. See Voice. Middle watch, the period from midnight to four A. M.; also, the men on watch during that time. Middle weight, a pugilist, boxer, or wrestler classed as of medium weight, i. E, over 140 and not over 160 lbs, in distinction from those classed as light weights, heavy weights, etc. Origin: OE. Middel, AS. Middel; akin to D. Middel, OHG. Muttil, G. Mittel. See Mid. Source: Websters Dictionary (01 Mar 1998) |
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| middle atlantoepistrophic joint | A pivot synovial joint between the dens of the axis and the ring formed by the anterior arch and the transverse ligament of the atlas. Synonym: articulatio atlantoaxialis mediana, Cruveilhier's joint, middle atlantoepistrophic joint. (05 Mar 2000) |
| middle axillary line | A vertical line intersecting a point midway between the anterior and posterior axillary folds or lines. Synonym: linea axillaris media, linea medio-axillaris, middle axillary line. (05 Mar 2000) |
| middle cardiac vein | <anatomy, vein> Begins at the apex of the heart (where it anastomoses with the great cardiac vein), and ascends within the posterior interventricular sulcus to the coronary sinus. Synonym: vena cordis media, inferior cardiac vein. (05 Mar 2000) |
| middle carpal joint | The synovial joint between the proximal and distal rows of carpal bones. Synonym: articulatio mediocarpea, middle carpal joint. (05 Mar 2000) |
| middle cells | The middle group of air cells of the ethmoidal sinus's; each sinus communicates with the middle meatus of the nasal cavity. Synonym: sinus ethmoidales mediae, cellulae mediae, middle cells, middle ethmoidal sinuses. (05 Mar 2000) |
| middle cerebellar peduncle | The largest of three paired cerebellar peduncles, composed mainly of fibres that originate in the pontine nuclei, cross the midline in the ventral part of pons, and emerge on the opposite side as a massive bundle arching dorsally along the lateral side of the pontine tegmentum into the cerebellum; its fibres are distributed chiefly to the cortex of the cerebellar hemisphere. Synonym: pedunculus cerebellaris medius, brachium pontis. (05 Mar 2000) |
| middle cerebral artery | <anatomy, artery> One of the two large terminal branches (with anterior cerebral artery) of the internal carotid artery; it passes laterally around the pole of the temporal lobe, then posteriorly in the depth of the lateral cerebral fissure; for descriptive purposes it is divided into three parts: 1) the sphenoidal part (M1 segment of clinical terminology), supplying perforating branches to the internal capsule, thalamus, and striate body; 2) the insular part, supplying branches to the insula and adjacent cortical areas; and 3) the terminal part or cortical part, supplying a large part of the central cortical convexity (the latter two collectively forming M2 segment). Synonym: arteria cerebri media. (05 Mar 2000) |
| middle cervical cardiac nerve | <anatomy, nerve> One of the cardiopulmonary splanchnic nerves conveying postsynaptic sympathetic fibres running downward, from the middle cervical ganglion along the subclavian artery (on the left) or the brachiocephalic (on the right side) to join the cardiac plexus. Synonym: nervus cardiacus cervicalis medius. (05 Mar 2000) |
| middle cervical fascia | The layer of fascia investing the infrahyoid muscles and contributing to the formation of the carotid sheath. Synonym: lamina pretrachealis, middle cervical fascia, Porter's fascia, pretracheal layer. (05 Mar 2000) |
| middle cervical ganglion | A sympathetic ganglion, of small size and sometimes absent; located at the level of the cricoid cartilage. Synonym: ganglion cervicale medium. (05 Mar 2000) |
| middle cluneal nerves | Terminal branches of the dorsal primary rami of the sacral nerves, supplying the skin of the mid-gluteal region. Synonym: nervi clunium medii. (05 Mar 2000) |
| middle colic artery | <anatomy, artery> Origin, superior mesenteric; distribution, transverse colon; anastomoses, right and left colic. Synonym: arteria colica media. (05 Mar 2000) |
| middle colic lymph nodes | Nodes along the middle colic artery and its branches that drain the right colic flexure and most of the transverse colon. Synonym: nodi lymphatici colici medii. (05 Mar 2000) |
| middle colic vein | <anatomy, vein> The tributary of the superior mesenteric vein that carries drainage of the transverse colon and accompanies the middle colic artery. Synonym: vena colica media. (05 Mar 2000) |