| habenular nucleus | The gray matter of the habenula, composed of a small-celled medial and a larger-celled lateral habenular nucleus; both nuclei receive fibres from basal forebrain regions (septum, basal nucleus, lateral preoptic nucleus); the lateral habenular nucleus receives an additional projection from the medial segment of the globus pallidus. Both nuclei project by way of the retroflex fasciculus to the interpeduncular nucleus and a medial zone of the midbrain tegmentum. Synonym: nucleus habenulae, ganglion habenulae. (05 Mar 2000) |
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| habenular sulcus | A small groove located between the habenular trigone and the adjacent dorsal thalamus. (05 Mar 2000) |
| habenular trigone | A small triangular area on the dorsomedial surface of the thalamus at the caudal end of the medullary stria, corresponding to the underlying habenula. Synonym: trigonum habenulae, trigone of habenula. (05 Mar 2000) |
| habenulointerpeduncular tract | A compact bundle of fibres arising in the habenula and passing ventralward to the interpeduncular nucleus at the base of the midbrain; part of its fibres bypass this nucleus and terminate in the raphe nuclei of the caudal mesencephalic tegmentum. Synonym: fasciculus retroflexus, habenulointerpeduncular tract, Meynert's fasciculus, Meynert's retroflex bundle. (05 Mar 2000) |
| habenulopeduncular tract | habenulopeduncular tract |
| Haber's syndrome | <syndrome> A permanent flushing and telangiectasia of the cheeks, nose, forehead, and chin, with prominent follicular openings, small papules with scaling, and minute pitted areas; occasionally accompanied by scaly and keratotic lesions of the trunk. (05 Mar 2000) |
| Haber, Henry | <person> 20th century British dermatologist. See: Haber's syndrome. (05 Mar 2000) |
| Haber-Weiss reaction | The reaction of superoxide (O2-- with hydrogen peroxide to produce molecular oxygen (O2), hydroxide radical (OH-), and OH-; often, iron catalyzed; a source of oxidative stress in blood cells and various tissues. (05 Mar 2000) |
| haberdasher | 1. A dealer in small wares, as tapes, pins, needles, and thread; also, a hatter. "The haberdasher heapeth wealth by hats." (Gascoigne) 2. A dealer in drapery goods of various descriptions, as laces, silks, trimmings, etc. Origin: Prob. Fr. Icel. Hapurtask trumpery, trifles, perh. Through French. It is possibly akin to E. Haversack, and to Icel. Taska trunk, chest, pocket, G. Tasche pocket, and the orig. Sense was perh, peddler's wares. Source: Websters Dictionary (01 Mar 1998) |
| Habermann, R | <person> German dermatologist, 1884-1941. See: Mucha-Habermann disease, Mucha-Habermann syndrome. (05 Mar 2000) |
| habit | <botany> The growth form of a plant, comprising its size, shape, texture and orientation. (09 Oct 1997) |
| habit chorea | <clinical sign> An involuntary compulsive, repetitive, stereotyped movement, resembling a purposeful movement because it is coordinated and involves muscles in their normal synergistic relationships, tics usually involve the face and shoulders. (18 Nov 1997) |
| habit scoliosis | Scoliosis supposedly due to habitual standing or sitting in an improper position. (05 Mar 2000) |
| habit spasm | <clinical sign> An involuntary compulsive, repetitive, stereotyped movement, resembling a purposeful movement because it is coordinated and involves muscles in their normal synergistic relationships, tics usually involve the face and shoulders. (18 Nov 1997) |
| habit tic | A habitual repetition of some grimace, shrug of the shoulder, twisting or jerking of the head, or the like. (05 Mar 2000) |