| latent zone | That portion of the cerebral cortex, the stimulation of which produces no movement and a lesion of which produces no symptoms; mainly the more anterior areas of the frontal lobes. (05 Mar 2000) |
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| frontal zone contraction theory | Model proposed to account for the movement of giant amoebae in which cytoplasmic contraction at the front of the leading pseudopod (fountain zone) pulls viscoelastic cytoplasm forward in the centre of the cell and forms a tube of more rigid cytoplasm immediately below the plasma membrane behind the active region. The peripheral contracted cytoplasm relaxes into a weaker gel at the rear and is pulled forward in its turn. Contrasts with the ectoplasmic tube contraction model. (18 Nov 1997) |
| Lissauer's marginal zone | A longitudinal bundle of thin, unmyelinated and poorly myelinated fibres capping the apex of the posterior horn of the spinal gray matter, composed of posterior root fibres and short association fibres that interconnect neighboring segments of the posterior horn. Synonym: fasciculus dorsolateralis, tractus dorsolateralis, dorsolateral tract, fasciculus marginalis, Lissauer's bundle, Lissauer's column, Lissauer's fasciculus, Lissauer's marginal zone, Lissauer's tract, marginal fasciculus, Spitzka's marginal tract, Spitzka's marginal zone, Waldeyer's tract, Waldeyer's zonal layer. (05 Mar 2000) |
| anterior medial malleolar artery | <anatomy, artery> Origin, anterior tibial; distribution, ankle joint and neighboring integument; anastomoses, branches of posterior tibial. Synonym: arteria malleolaris anterior medialis. (05 Mar 2000) |
| bilateral medial orbital ecchymoses | <clinical sign, ophthalmology> The appearance of the eyes produced by subconjunctival haemorrhage and/or periorbital ecchymosis. Synonym: bilateral medial orbital ecchymoses. (21 Jun 2000) |
| calcarine branch of medial occipital artery | <anatomy, artery> Branch of medial occipital artery which runs in relationship to the calcarine sulcus. Synonym: ramus calcarinus arteriae occipitalis medialis, arteria calcarina, calcarine artery. (05 Mar 2000) |
| parietal branch of medial occipital artery | <anatomy, artery> An anterior branch of the medial occipital artery supplying the posterior section of the parietal lobe of the cerebrum. Synonym: ramus parietalis arteriae occipitalis medialis. (05 Mar 2000) |
| medial | The side of the body or bdy part that is nearer to the middle or centre (median) of the body. For example, when referring to the knee, medial would mean the side of the knee that is closest to the other knee the opposite of medial is lateral. (12 Dec 1998) |
| medial accessory olivary nucleus | A detached part of the olivary nucleus medial to the latter's main body, against the lateral side of the medial lemniscus and pyramidal tract. Synonym: nucleus olivaris accessorius medialis. (05 Mar 2000) |
| medial angle of eye | The angle formed by the union of the upper and lower eyelids medially. Synonym: angulus oculi medialis, angulus oculi nasalis, internal canthus, medial canthus. (05 Mar 2000) |
| medial antebrachial cutaneous nerve | <anatomy, nerve> Arises from the medial cord of the brachial plexus, passes downward in company with the brachial artery and then the basilic vein, and supplies the skin of the anterior and ulnar surfaces of the forearm. Synonym: nervus cutaneus antebrachii medialis, medial cutaneous nerve of forearm. (05 Mar 2000) |
| medial anterior thoracic nerve | <anatomy, nerve> A nerve that arises from the medial cord of the brachial plexus to supply the pectoral muscles; usually pierces pectoralis minor, then continues to supply mainly the sternocostal portion of pectoralis major. Synonym: nervus pectoralis medialis, medial anterior thoracic nerve. (05 Mar 2000) |
| 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) |
| 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) |