| medial aperture of the fourth ventricle | The large midline opening in the posterior inferior part of the roof of the fourth ventricle, connecting the ventricle with the cerebellomedullary cistern. Synonym: apertura mediana ventriculi quarti, arachnoid foramen, Magendie's foramen, median aperture of the fourth ventricle. (05 Mar 2000) |
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| medial arcuate ligament | <anatomy> One of Haller's arches; a tendinous thickening of the psoas fascia that extends from the body of the first lumbar vertebra to its transverse process on either side. A portion of the diaphragm arises from it. Synonym: ligamentum arcuatum mediale, arcus lumbocostalis medialis, medial lumbocostal arch. (05 Mar 2000) |
| medial arteriole of retina | An arteriole supplying the part of the retina between the optic disk and the macula. Synonym: arteriola medialis retinae. (05 Mar 2000) |
| medial arteriosclerosis | Arterial sclerosis involving the peripheral arteries, especially of the legs of older people, with deposition of calcium in the medial coat (pipestem arteries) but with little or no encroachment on the lumen. Synonym: medial arteriosclerosis, Monckeberg's calcification, Monckeberg's degeneration, Monckeberg's medial calcification, Monckeberg's sclerosis. (05 Mar 2000) |
| medial atrial vein | A vein that drains deep portions of the parietal and occipital lobes; it runs in the medial wall of the lateral ventricle to empty into the internal cerebral vein or the great cerebral vein. Synonym: vena ventriculi lateralis medialis, medial atrial vein, medial vein of lateral ventricle. (05 Mar 2000) |
| medial basal segment | Cardiac segment; medial basal segment of inferior lobe of right and left lung; can only be seen from medial and inferior surfaces since it does not reach lateral surface of lung. Synonym: segmentum basale mediale, segmentum cardiacum, cardiac segment. (05 Mar 2000) |
| medial bicipital groove | at the cubital fossa, the groove separating the biceps brachii and brachialis muscles on the medial side. Synonym: sulcus bicipitalis medialis. (05 Mar 2000) |
| medial border | The border of a structure closest to the medial plane. Synonym: margo medialis, medial margin. (05 Mar 2000) |
| medial border of foot | The inner border of the foot extending from heel to the great toe. Synonym: margo medialis pedis, margo tibialis pedis, tibial border of foot. (05 Mar 2000) |
| medial border of forearm | An imaginary line extrapolated from the medial epicondyle of the humerus to the styloid process of the ulna, forming a border between the anterior and posterior surfaces. Synonym: margo medialis antebrachii, margo ulnaris antebrachii, ulnar margin of forearm. (05 Mar 2000) |
| medial border of humerus | The ridge on the humerus extending from the crest of the lesser tubercle to the medial epicondyle. Synonym: margo medialis humerii. (05 Mar 2000) |
| medial border of kidney | The concave border of the kidney. Synonym: margo medialis renis. (05 Mar 2000) |
| medial border of scapula | The edge of the scapula closest to the vertebral column, extending from superior angle to inferior angle. Synonym: margo medialis scapulae, vertebral border of scapula. (05 Mar 2000) |
| medial border of suprarenal gland | The paravertebral edge of the suprarenal gland. Synonym: margo medialis glandulae suprarenalis. (05 Mar 2000) |
| medial border of tibia | The rounded border of the tibia that separates the posterior and medial surfaces. Synonym: margo medialis tibiae. (05 Mar 2000) |