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mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


hemisphere
1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. ... 2. Half of the terrestrial globe, or a projection of the same in a map or picture. ... 3. The people who inhabit a hemisphere. 'He died . . . Mourned by a hemisphere.' (J. P. Peters)ten Cerebral hemispheres. ... <anatomy> See Brain. ... <ph …

hemisphere of bulb of penis
One of the lateral halves of the bulb of the penis that are separated by a median groove on the posterior part of the undersurface. ... Synonym: hemispherium bulbi urethrae. ... (05 Mar 2000) ...

hemispherectomy
<procedure> Excision of one cerebral hemisphere; undertaken for malignant tumours, intractable epilepsy usually associated with infantile hemiplegia due to birth injury, and other cerebral conditions. ... (05 Mar 2000) ...

hemispherium
Synonym: hemisphere. ... Synonym: cerebellar hemisphere. ... Origin: G. Hemisphairion ... (05 Mar 2000) ...

hemispherium bulbi urethrae
Synonym for hemisphere of bulb of penis ... One of the lateral halves of the bulb of the penis that are separated by a median groove on the posterior part of the undersurface. ... Synonym: hemispherium bulbi urethrae. ... (05 Mar 2000) ...

hemispherium cerebelli
Synonym for cerebellar hemisphere ... The large part of the cerebellum lateral to the vermis cerebelli. ... Synonym: hemispherium cerebelli, hemispherium. ... (05 Mar 2000) ...

hemispherium cerebri
Synonym for hemisphere ... 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. ... 2. Half of the terrestrial globe, or a projection of the same in a map or picture. ... 3. The people who inhabit a hemisphere. 'He died . . . Mourned by a hemisphere.' (J. P. Peters)ten Cerebral hemispheres. ... <anatom …

Hemispora
Generic name for certain species of Fungi Imperfecti in which chains of conidia develop from tubular structures that form as the result of a constriction at the end of each of a series of short hyphal branches; close septations divide the contents of the tube into relatively square, thick-walled, deeply staining segments that eventually separate an …

hemistrumectomy
<procedure> Rarely used term for excision of approximately one-half of a goiter. ... Origin: hemi-+ L. Struma, + G. Ektome, excision ... (05 Mar 2000) ...

hemists
<botany> Organic soils (mucky peats and peaty mucks) in which plant remains show a fair amount of decomposition, between one-third and two-thirds of the fibres are still visible upon rubbing the material between the fingers. ... (09 Oct 1997) ...

hemisubstance
An amorphous substance found in cell walls. ... (05 Mar 2000) ...

hemisulfur mustard
2-(2-chloroethylthio)ethanol ... An antineoplastic agent. ... Synonym: mustard chlorohydrin, semisulfur mustard. ... (05 Mar 2000) ...

hemisyndrome
1. A condition in which one-half of the body is atrophied or hypertrophied. ... 2. Unilateral lesion of the spinal cord. ... (05 Mar 2000) ...

hemisystole
<physiology> Contraction of only one ventricle of the heart. ... Hemisystole is noticed in rare cases of insufficiency of the mitral valve, in which both ventricles at times contract simultaneously, as in a normal heart, this condition alternating with contraction of the right ventricle alone; hence, intermittent hemisystole. ... Source: Webste …

hemiterpene
Isoprene or a derivative of a single isoprene. ... (05 Mar 2000) ...

hemithermoanesthesia
Loss of sensibility to heat and cold affecting one side of the body. ... (05 Mar 2000) ...

hemithoracic duct
An accessory thoracic duct, usually emptying into the thoracic duct but sometimes discharging independently into the right subclavian vein. ... Synonym: ductus hemithoracicus. ... (05 Mar 2000) ...

hemithorax
One side of the thorax. ... (05 Mar 2000) ...

hemitonia
Synonym for hemihypertonia ... Exaggerated muscular tonicity on one side of the body. ... Synonym: hemitonia. ... Origin: hemi-+ G. Hyper, over, + tonos, tone ... (05 Mar 2000) ...

hemitremor
Tremor affecting the muscles of one side of the body. ... (05 Mar 2000) ...

hemitruncus
A variant truncus arteriosus in which only one pulmonary artery originates from the truncal artery. ... (05 Mar 2000) ...

hemivertebra
A congenital defect of the spine in which one side of a vertebra fails to develop completely. ... (05 Mar 2000) ...

hemizona assay
<investigation> The hemizona assay is a laboratory test of the ability of sperm to penetrate into a human egg, first the egg is split in half, then one half is tested against the husband's sperm and the other half against sperm from a fertile man. ... (09 Oct 1997) ...

hemizygosity
The state of being hemizygous. ... (05 Mar 2000) ...

hemizygote
<cell biology, genetics> Nucleus, cell or organism that has only one of a normally diploid set of genes. In mammals the male is hemizygous for the X chromosome. ... (18 Nov 1997) ...

hemizygotic
Synonym for hemizygous ... <genetics> A situation within a cell where only one copy of a gene or group of genes is present instead of the usual two copies per gene in a diploid genome. The word is used as in the following example: the cell is hemizygous for gene X. ... (09 Oct 1997) ...

hemizygous
<genetics> A situation within a cell where only one copy of a gene or group of genes is present instead of the usual two copies per gene in a diploid genome. The word is used as in the following example: the cell is hemizygous for gene X. ... (09 Oct 1997) ...

hemizygous gene
<genetics> Any gene which is present as only one copy in a diploid genome, when most other genes in the genome are present as two copies. The genes on the sex chromosomes of members of the heterogametic sex of a species are all hemizygous genes (for example: in humans, males have hemizygous genes on their X and Y chromosomes because they do n …

hemlock
1. <botany> The name of several poisonous umbelliferous herbs having finely cut leaves and small white flowers, as the Cicuta maculata, bulbifera, and virosa, and the Conium maculatum. See Conium. ... The potion of hemlock administered to Socrates is by some thought to have been a decoction of Cicuta virosa, or water hemlock, by others, of Con …

hemming filter
<apparatus> A filter placed between two tubes attached to each other, often used with centrifuges to selectively remove a substance of interest from a mixture in one tube and deposit the substance into the other tube. ... (09 Oct 1997) ...

hemocyanin
Synonym for haemocyanin ... <chemical> Blue, oxygen transporting, copper containing protein found in the blood of molluscs and crustacea. ... A very large protein with 20-40 subunits and molecular weight of 2-8 million and having a characteristic cuboidal appearance under the electron microscope. Prior to the introduction of immunogold techniqu …

hemocyte
Synonym for haemocyte ... <haematology> Blood cell, associated with a haemocoel, particularly those of insects and crustacea. Despite the name they are more leucocyte like, being phagocytic and involved in defence and clotting of haemolymph and not involved in transport of oxygen. ... (18 Nov 1997) ...

hemodialysis
Synonym for haemodialysis ... <nephrology, procedure> The removal of certain elements from the blood by virtue of the difference in the rates of their diffusion through a semipermeable membrane, for example, by means of a haemodialysis machine or filter. ... Origin: Gr. Lysis = dissolution ... (18 Nov 1997) ...

hemoglobin
Synonym for haemoglobin ... <cell biology, haematology> Four subunit globular oxygen carrying protein of the erythrocytes of vertebrates and some invertebrates. ... It is a conjugated protein containing four haem groups and globin. There are two alpha and two beta chains (very similar to myoglobin) in adult humans, the haem moiety (an iron cont …

hemoglobinopathy
Synonym for haemoglobinopathy ... <disease, haematology> Disorder due to abnormalities in the haemoglobin molecule, the best known being sickle cell anaemia in which there is a single amino acid substitution (valine for glutamate) in position 6 of the beta chain. In other cases one of the globin chains is synthesised at a slower rate, despite …

hemolysin
Synonym for haemolysin ... <protein> Bacterial exotoxins that can lyse erythrocytes. ... (18 Nov 1997) ...

hemolysis
Synonym for haemolysis ... <haematology> Disruption of the integrity of the red cell membrane causing release of haemoglobin. ... Haemolysis may be caused by bacterial haemolysins, by antibodies that cause complement dependent lysis, by placing red cells in a hypotonic solution or by defects in the red cell membrane. ... Origin: Gr. Lysis = diss …

hemolytic anaemia
Synonym for haemolytic anaemia ... <disease, haematology> Anaemia resulting from reduced red cell survival time and haemolysis, either due to an intrinsic defect in the erythrocyte (hereditary spherocytosis or ellipsocytosis, enzyme defects, haemoglobinopathy) or an extrinsic damaging agent. ... For example autoantibody (autoimmune haemolytic a …

hemonectin
Synonym for haemonectin ... <protein> A 60 kD protein found in the bone marrow matrix of mice specifically aiding adhesion of granulocyte lineage cells. ... (18 Nov 1997) ...

hemopathy
Synonym for haemopathy ... <haematology> Any disease of the blood. ... Origin: Gr. Pathos = disease ... (18 Nov 1997) ...

hemoperfusion
Synonym for haemoperfusion ... <physiology> The act of pouring over or through, especially the passage of blood through the vessels of a specific organ. ... (18 Nov 1997) ...

hemopexin
Synonym for haemopexin ... <protein> Single chain haem binding plasma _1 glycoprotein (57 kD) unlike haptoglobin does not bind haemoglobin. ... Present at around 1mg/ml in plasma. Responsible for transporting haem groups to the liver for breakdown. Structurally related to vitronectin and some collagenases. ... (18 Nov 1997) ...

hemophilia
Synonym for haemophilia ... <disease, haematology> A haemorrhagic diathesis occurring in two main forms: ... 1. Haemophilia A (classic haemophilia, factor VIII deficiency), an X linked disorder due to deficiency of coagulation factor VIII. ... 2. Haemophilia B (factor IX deficiency, Christmas disease), also X linked, due to deficiency of coagula …

hemopoietic
Synonym for haemopoietic ... <pharmacology> Refers to an agent or process that affects or promotes the formation of blood cells. ... (09 Oct 1997) ...

hemoptysis
Synonym for haemoptysis ... <symptom> The expectoration of blood or of blood stained sputum. ... Origin: Gr. Ptyein = to spit ... (18 Nov 1997) ...

hemorrhage
Synonym for haemorrhage ... <physiology> The escape of blood from the vessels, bleeding. ... Small haemorrhages are classified according to size as petechiae (very small), purpura (up to 1 cm) and ecchymoses (larger). The massive accumulation of blood within a tissue is called a haematoma. ... Origin: Gr. Rhegnynai = to burst forth ... (18 Nov 19 …

hemorrhagic
Synonym for haemorrhagic ... <haematology> Relating to bleeding and haemorrhage. ... (09 Oct 1997) ...

hemorrhoid
Synonym for haemorrhoids ... <anatomy, surgery> A varicose dilatation of a vein of the superior or inferior haemorrhoidal plexus, resulting from a persistent increase in venous pressure. ... Presents as a livid and painful swelling formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus i …

hemorrhoids
Synonym for haemorrhoids ... <anatomy, surgery> A varicose dilatation of a vein of the superior or inferior haemorrhoidal plexus, resulting from a persistent increase in venous pressure. ... Presents as a livid and painful swelling formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus i …

hemosiderin
Synonym for haemosiderin ... <protein> A mammalian iron storage protein related to ferritin but less abundant. ... (18 Nov 1997) ...

hemostasis
Synonym for haemostasis ... <haematology, physiology, haematology> The arrest of bleeding, either by the physiological properties of vasoconstriction and coagulation or by surgical means. ... Origin: Gr. Stasis = halt ... (18 Nov 1997) ...

hemotaphonomy
Synonym for haemotaphonomy ... <study> The study of bloodstains, and specially of the changes in appearance and size of the cellular components, as well as the characteristics of their cell position and appearance in function of the superficial topography and composition of the substrate. ... (27 Nov 1998) ...

hemp
<botany> Cannabis sativa, a plant native to Asia. The term hemp may refer to the tall, coarse plant itself or to the coarse, tough fibre from the plant, which can be used to make rope, fabric, etc. ... The word is also used to refer to any drug derived from this plant, such as marijuana and/or hashish. ... (09 Oct 1997) ...

hempa
<chemical> Hexamethylphosphoric triamide. Chemosterilant. According to the fourth annual report on carcinogens (ntp 85-002, 1985), this substance may reasonably be anticipated to be a carcinogen (merck, 11th ed). ... Pharmacological action: carcinogens, chemosterilants. ... Chemical name: Phosphoric triamide, hexamethyl- ... (12 Dec 1998) ...

HEMPAS
<abbreviation> Hereditary erythroblastic multinuclearity associated with positive acidified serum. ... See: HEMPAS cells. ... (05 Mar 2000) ...

HEMPAS cells
The abnormal erythrocytes of type II congenital dyserythropoietic anaemia. ... See: HEMPAS. ... (05 Mar 2000) ...

hen
<ornithology> The female of the domestic fowl; also, the female of grouse, pheasants, or any kind of birds; as, the heath hen; the gray hen. ... Used adjectively or in combination to indicate the female; as, hen canary, hen eagle, hen turkey, peahen. Hen clam. ... One of several species of large hawks which capture hens; especially, the America …

hen-cluck stertor
A breath sound like the clucking of a hen, sometimes heard in cases of postpharyngeal abscess. ... (05 Mar 2000) ...

Henderson-Hasselbalch equation
<chemistry> The Henderson-Hasselbalch equation is the equation: ... PH = pK + log ([A-]/[HA]) ... Where pH is the acidity or alkalinity of the buffer solution, pK is the negative logarithm of the equilibrium constant (Kd) for the ionisation of the acid form (A-) of the compound used to buffer the solution for the reaction HA = H+ +A-, [A-] is t …

Henderson, Lawrence
<person> U.S. Biochemist, 1879-1942. ... See: Henderson-Hasselbalch equation. ... (05 Mar 2000) ...

Hendersonula toruloidea
A species of black yeast capable of producing chronic infections of the nails as well as of the skin of the feet. ... (05 Mar 2000) ...

Henke, Wilhelm
<person> German anatomist, 1834-1896. ... See: Henke's space. ... (05 Mar 2000) ...

Henke's space
Retropharyngeal space. ... (05 Mar 2000) ...

Henle, Friedrich
<person> German anatomist, pathologist, and histologist born in Furth, near Nuremberg, 1809. ... He was a student and Prosector of Anatomy in Berlin and became Professor of Anatomy in Zurich in 1840. In 1844 went to Heidelberg. From 1852 until his death was professor of Anatomy in Gottingen. Was one of the most celebrated German Anatomists of …

Henle's ampulla
Synonym for ampulla of ductus deferens ... The dilation of the ductus deferens where it approaches its contralateral partner just before it is joined by the duct of the seminal vesicle. ... Synonym: ampulla ductus deferentis, Henle's ampulla. ... (05 Mar 2000) ...

Henle's fibre layer
The layer of inner cone fibres in the central area of the retina. ... (05 Mar 2000) ...

Henle's fissures
Minute spaces filled with connective tissue between the muscular fasciculi of the heart. ... (05 Mar 2000) ...

Henle's glands
Accessory lacrimal gland's located near the fornices in the medial part of the palpebral conjunctiva; they open on the conjunctiva surface. ... Synonym: Baumgarten's glands. ... (05 Mar 2000) ...

Henle's layer
The outer layer cells of the inner root sheath of the hair follicle. ... (05 Mar 2000) ...

Henle's membrane
Synonym for lamina basalis choroideae ... The transparent, nearly structureless inner layer of the choroid in contact with the pigmented layer of the retina. ... Synonym: basal lamina of choroid, basal layer of choroid, Bruch's membrane, Henle's membrane, lamina vitrea, vitreous lamella, vitreous membrane. ... (05 Mar 2000) ...

Henle's nervous layer
Synonym for entoretina ... The layers of the retina from the outer plexiform to the nerve fibre layer inclusive. ... Synonym: Henle's nervous layer. ... (05 Mar 2000) ...

Henle's reaction
Dark brown staining of the medullary cells of the adrenal bodies when treated with the salts of chromium, the cortical cells remaining unstained. ... (05 Mar 2000) ...

Henle's spine
Synonym for suprameatal spine ... Small bony prominence anterior to the supramastoid pit at the posterosuperior margin of the bony external acoustic meatus. ... Synonym: spina suprameatica, Henle's spine, meatal spine, spina meatus. ... (05 Mar 2000) ...

Henle's tubules
The straight portions of the uriniferous tubule's that form Henle's loop, distinguished as the descending and ascending tubule's of Henle. ... (05 Mar 2000) ...

Henle's warts
Synonym for Hassall-Henle bodies ... Hyaline body's on the posterior surface of Descemet's membrane at the periphery of the cornea. ... Synonym: Henle's warts. ... (05 Mar 2000) ...

henna
1. <botany> A thorny tree or shrub of the genus Lawsonia (L. Alba). The fragrant white blossoms are used by the Buddhists in religious ceremonies. The powdered leaves furnish a red colouring matter used in the East to stain the hails and fingers, the manes of horses, etc. ... 2. The leaves of the henna plant, or a preparation or dyestuff made …

Hennebert, Camille
<person> Belgian otologist, 1867-1958. ... See: Hennebert's sign. ... (05 Mar 2000) ...

Hennebert's sign
<clinical sign> Nystagmus produced by pressure applied to a sealed external auditory canal; may be seen in labyrinthine fistula or with intact tympanic membrane in syphilitic involvement of the otic capsule. ... (05 Mar 2000) ...

henoch-schoenlein syndrome
<radiology> Acute, self-limited arteritis, often follows Strep infection, symptoms: purpura, nephritis, abdominal pain, joint pain, thick small bowel folds, thumbprinting in small bowel or colon ... (12 Dec 1998) ...

Henoch-Schonlein purpura
<dermatology> This relatively rare disorder is characterised by skin purpura, joint pains, abdominal pain and renal disease (glomerulonephritis). ... Although Henoch-Schonlein purpura or anaphylactoid purpura, is thought to be a immune complex mediated disease, its exact cause is unknown. Its typical benign coarse can, however, include renal f …

Henoch-Schonlein syndrome
Synonym for Henoch-Schonlein purpura ... <dermatology> This relatively rare disorder is characterised by skin purpura, joint pains, abdominal pain and renal disease (glomerulonephritis). ... Although Henoch-Schonlein purpura or anaphylactoid purpura, is thought to be a immune complex mediated disease, its exact cause is unknown. Its typical ben …

Henoch, Eduard
<person> German paediatrician, 1820-1910. ... See: Henoch's chorea, Henoch's purpura, Henoch-Schonlein purpura, Henoch-Schonlein syndrome, Schonlein-Henoch syndrome. ... (05 Mar 2000) ...

Henoch's chorea
Synonym for spasmodic tic ... A disorder in which sudden spasmodic coordinated movements of certain muscles or groups of physiologically related muscles occur at irregular intervals. ... Synonym: Henoch's chorea. ... (05 Mar 2000) ...

Henoch's purpura
Synonym for Henoch-Schonlein purpura ... <dermatology> This relatively rare disorder is characterised by skin purpura, joint pains, abdominal pain and renal disease (glomerulonephritis). ... Although Henoch-Schonlein purpura or anaphylactoid purpura, is thought to be a immune complex mediated disease, its exact cause is unknown. Its typical ben …

henpuye
Synonym: goundou. ... Origin: native term on the Gold Coast (Ghana) meaning 'dog-nose' ... (05 Mar 2000) ...

Henri, Victor
<person> French 20th-century biochemist. ... See: Michaelis-Menten equation. ... (05 Mar 2000) ...

Henry-Gauer response
Inhibition of antidiuretic hormone secretion due to a rise in atrial pressure which stimulates atrial stretch receptors. ... (05 Mar 2000) ...

Henry, James Paget
<person> U. S. Physiologist, *1914. ... See: Henry-Gauer response. ... (05 Mar 2000) ...

Henry, Joseph
<person> U.S. Physicist, 1797-1878. ... See: Dalton-Henry law. ... (05 Mar 2000) ...

Henry, William
<person> British chemist, 1775-1837. ... See: Henry's law. ... (05 Mar 2000) ...

Henry's law
at equilibrium, at a given temperature, the amount of gas dissolved in a given volume of liquid is directly proportional to the partial pressure of that gas in the gas phase (this only holds for gases that do not react chemically with the solvent). ... (05 Mar 2000) ...

Henseleit, K
<person> German internist, *1907. ... See: Krebs-Henseleit cycle. ... (05 Mar 2000) ...

Hensen, Victor
<person> German anatomist and physiologist, 1835-1924. ... See: Hensen's canal, Hensen's cell, Hensen's disk, Hensen's duct, Hensen's knot, Hensen's line, Hensen's node, Hensen's stripe. ... (05 Mar 2000) ...

Hensen's canal
Synonym for uniting duct ... A short membranous tube passing from the lower end of the saccule to the cochlear duct of the membranous labyrinth. ... Synonym: ductus reuniens, canaliculus reuniens, canalis reuniens, Hensen's canal, Hensen's duct, uniting canal. ... (05 Mar 2000) ...

Hensen's cell
One of the supporting cell's in the organ of Corti, immediately to the outer side of the cell's of Deiters. ... (05 Mar 2000) ...

Hensen's disk
Synonym for h band ... <cell biology> The H band is an area within muscle tissue which is light when stained and consists only of myosin fibres (and no actin fibres). The H band is at the centre of each muscle sarcomere. ... (09 Oct 1997) ...

Hensen's duct
Synonym for uniting duct ... A short membranous tube passing from the lower end of the saccule to the cochlear duct of the membranous labyrinth. ... Synonym: ductus reuniens, canaliculus reuniens, canalis reuniens, Hensen's canal, Hensen's duct, uniting canal. ... (05 Mar 2000) ...

Hensen's knot
Synonym: primitive node. ... (05 Mar 2000) ...

Hensen's line
Synonym for h band ... <cell biology> The H band is an area within muscle tissue which is light when stained and consists only of myosin fibres (and no actin fibres). The H band is at the centre of each muscle sarcomere. ... (09 Oct 1997) ...

Hensen's node
Synonym for primitive node ... A local thickening of the blastoderm at the cephalic end of the primitive streak of the embryo. ... Synonym: Hensen's knot, Hensen's node, Hubrecht's protochordal knot, primitive knot, protochordal knot. ... (05 Mar 2000) ...