| Haller's vascular tissue | <anatomy> The outer portion of the choroid of the eye containing the largest blood vessels. Synonym: lamina vasculosa choroideae, Haller's vascular tissue, uvaeformis, vascular layer of choroid coat of eye, vascular layer. (05 Mar 2000) |
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| Haller, Albrecht von | <person> Swiss physiologist, 1708-1777. See: Haller's ansa, Haller's annulus, Haller's arches, Haller's circle, Haller's cones, Haller's habenula, Haller's insula, Haller's line, Haller's plexus, Haller's rete, Haller's vascular tissue, Haller's tripod, Haller's tunica vasculosa, Haller's unguis, Haller's vas aberrans. (05 Mar 2000) |
| hallermann's syndrome | <syndrome> An oculomandibulofacial syndrome principally characterised by dyscephaly (usually brachycephaly), parrot nose, mandibular hypoplasia, proportionate nanism, hypotrichosis, bilateral congenital cataracts, and microphthalmia. (12 Dec 1998) |
| Hallermann, Wilhelm | <person> 20th century German ophthalmologist. See: Hallermann-Streiff syndrome, Hallermann-Streiff-Francois syndrome. (05 Mar 2000) |
| Hallermann-Streiff syndrome | A syndrome of bony anomalies of the calvaria, face, and jaw, with brachygnathia, narrow curved nose, and multiple ocular defects including microphthalmia, microcornea, and cataract, often with alopecia overlying skull sutures, or alopecia areata and hypoplasia, or absence of eyebrows. The pattern of inheritance is undecided. Synonym: congenital sutural alopecia, Hallermann-Streiff syndrome, Hallermann-Streiff-Francois syndrome, mandibulo-oculofacial syndrome, oculomandibulodyscephaly, oculomandibulofacial syndrome, progeria with cataract, progeria with microphthalmia. (05 Mar 2000) |
| Hallermann-Streiff-Francois syndrome | A syndrome of bony anomalies of the calvaria, face, and jaw, with brachygnathia, narrow curved nose, and multiple ocular defects including microphthalmia, microcornea, and cataract, often with alopecia overlying skull sutures, or alopecia areata and hypoplasia, or absence of eyebrows. The pattern of inheritance is undecided. Synonym: congenital sutural alopecia, Hallermann-Streiff syndrome, Hallermann-Streiff-Francois syndrome, mandibulo-oculofacial syndrome, oculomandibulodyscephaly, oculomandibulofacial syndrome, progeria with cataract, progeria with microphthalmia. (05 Mar 2000) |
| Hallervorden syndrome | <neurology, syndrome> A progressive hereditary disorder with marked reduction in the number of myelin sheaths of the globus pallidus and substantia nigra with accumulation of iron pigment. Manifestations include dysarthria, progressive mental deterioration, and corticospinal and extrapyramidal motor signs. CT findings: high-signal lesions in globus pallidus bilaterally. MRI findings: (T2-weighted spin-echo), hypointensity in globus pallidus (iron accumulation), small area of hyperintensity in internal segment (so-called eye of the tiger sign) corresponding to area of gliosis and vacuolation. Inheritance: autosomal recessive. (20 Mar 2000) |
| Hallervorden, Julius | <person> German neurologist, 1882-1965. See: Hallervorden syndrome, Hallervorden-Spatz disease, Hallervorden-Spatz syndrome. (05 Mar 2000) |
| Hallervorden-Spatz syndrome | <neurology, syndrome> A progressive hereditary disorder with marked reduction in the number of myelin sheaths of the globus pallidus and substantia nigra with accumulation of iron pigment. Manifestations include dysarthria, progressive mental deterioration, and corticospinal and extrapyramidal motor signs. CT findings: high-signal lesions in globus pallidus bilaterally. MRI findings: (T2-weighted spin-echo), hypointensity in globus pallidus (iron accumulation), small area of hyperintensity in internal segment (so-called eye of the tiger sign) corresponding to area of gliosis and vacuolation. Inheritance: autosomal recessive. (20 Mar 2000) |
| Hallgren's syndrome | <syndrome> Vestibulocerebellar ataxia, pigmentary retinal dystrophy, congenital deafness, and cataract. (05 Mar 2000) |
| Hallgren, Bertil | <person> 20th century Swedish geneticist. See: Hallgren's syndrome. (05 Mar 2000) |
| Hallopeau's disease | pustulosis palmaris et plantaris |
| Hallopeau, Francois | <person> French dermatologist, 1842-1919. See: Hallopeau's disease. (05 Mar 2000) |
| hallostemonous | <botany> Having but one series of stamens, and that equal in number to the proper number of petals; isostemonous. Origin: Gr. Simple + a thread. Source: Websters Dictionary (01 Mar 1998) |
| halloysite | <chemical> A claylike mineral, occurring in soft, smooth, amorphous masses, of a whitish colour. Origin: Named after Omalius d'Halloy. Source: Websters Dictionary (01 Mar 1998) |