Venule
A little vein. Venules go from capillaries to veins, vessels that carry blood low in oxygen content from the body back to the heart. The deoxygenated form of hemoglobin (deoxyhemoglobin) makes the blood in veins and venules appear dark. Veins and venules are part of the afferent wing of the circulatory system which returns blood to the heart. .
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A venous radicle continuous with a capillary. SYN: venula [TA], capillary vein, veinlet.
- high endothelial postcapillary venules venules in the lymph node s, tonsils, and Peyer patches that have a high-walled endothelium through which blood lymphocytes migrate from the blood into the lymphatic parenchyma.
- inferior macular v. [TA] a small tributary of the central vein of the retina that drains the lower part of the macula. SYN: venula macularis inferior [TA].
- inferior nasal retinal v. [TA] the small vein that passes from the inferior medial (nasal) part of the retina to join the central vein. SYN: venula nasalis retinae inferior [TA], inferior nasal v. of retina.
- inferior temporal retinal v. [TA] the small vein that passes from the lower lateral (temporal) part of the retina to enter the central vein. SYN: venula temporalis retinae inferior [TA], inferior temporal v. of retina.
- medial v. of retina [TA] the small vein that passes from the part of the retina between the macula and the optic disk to join the central vein. SYN: venula medialis retinae [TA].
- pericytic venules SYN: postcapillary venules.
- postcapillary venules the microvasculature immediately following the capillaries, ranging in size from 10 to 50 μm, and characterized by investment of pericytes; they are the site of extravasation of blood cells, are particularly sensitive to histamine, and are believed to be important in blood-interstitial fluid exchanges. SYN: pericytic venules.
- stellate venules SYN: venulae stellatae, under venula.
- straight venules of kidney SYN: venulae rectae of kidney, under venula.
- superior macular v. [TA] a small tributary of the central vein of the retina that drains the upper part of the macula. SYN: venula macularis superior [TA].
- superior nasal retinal v. [TA] the small vein that drains blood from the upper medial (nasal) part of the retina; it joins the central vein. SYN: venula nasalis retinae superior [TA], superior nasal v. of retina.
- superior temporal retinal v. [TA] the v. that passes from the upper lateral (temporal) part of the retina to join the central vein. SYN: venula temporalis retinae superior [TA], superior temporal v. of retina.

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ve·nule 'vēn-(.)yü(ə)l, 'ven- n a small vein esp any of the minute veins connecting the capillaries with the larger systemic veins

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n.
a minute vessel that drains blood from the capillaries. Many venules unite to form a vein.

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ven·ule (venґūl) venula; any of the small vessels that collect blood from the capillary plexuses and join to form veins. venular adj

Medical dictionary. 2011.

Look at other dictionaries:

  • venulė — statusas T sritis histologija, ląstelių chemija, histologinė chemija, audinių kultūra atitikmenys: lot. Venula ryšiai: platesnis terminas – venos siauresnis terminas – išorinis dangalas siauresnis terminas – pokapiliarinė venulė siauresnis… …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • venulė — statusas T sritis histologija atitikmenys: lot. Venula ryšiai: platesnis terminas – venos siauresnis terminas – išorinis dangalas siauresnis terminas – pokapiliarinė venulė siauresnis terminas – raumeninė venulė siauresnis terminas – surenkamoji… …   Medicininės histologijos ir embriologijos vardynas

  • Venule — Ven ule, n. [L. venula, dim. from vena vein.] A small vein; a veinlet; specifically (Zo[ o]l.), one of the small branches of the veins of the wings in insects. [1913 Webster] …   The Collaborative International Dictionary of English

  • Venüle —   [v ; Kurzwort aus Vene und Kanüle] die, / n, zur sterilen Entnahme von venösem Blut dienende evakuierte Glasampulle mit Hohlnadel. * * * Ve|nü|le, die; , n [Kurzwort aus Vene u. Kanüle] (Med.): Glasröhrchen mit eingeschmolzener ↑ …   Universal-Lexikon

  • venule — 1850, from L. venula, dim. of vena “vein” (see VEIN (Cf. vein)) …   Etymology dictionary

  • venulė — statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Venula ryšiai: platesnis terminas – apytakos organai …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • venule — Venule. s. f. Petite veine. Le sang se communique dans tout le corps par des venules. par de petites venules qui sont presque imperceptibles …   Dictionnaire de l'Académie française

  • venule — [ven′yo͞ol΄] n. [L venula, dim. of vena, vein] 1. Anat. a small vein; veinlet 2. Biol. any of the small branches of a vein in a leaf or in the wing of an insect venular [ven′yo͞o lər] adj. venulose [ven′yo͞o lōs΄] adj …   English World dictionary

  • Venule — A venule is a small blood vessel that allows deoxygenated blood to return from the capillary beds to the larger blood vessels called veins. Venules are blood vessels that drain blood directly from the capillary beds. Many venules unite to form a… …   Wikipedia

  • Venule — Eine Venole (lat. Venula, deutsch selten auch Venule) ist eine kleine Vene. Venolen sind mit den Arteriolen die feinsten, noch mit bloßem Auge sichtbaren Blutgefäße. Man kann sie z. B. an der Sclera (weiße Augenhaut) des Auges als feine… …   Deutsch Wikipedia

  • Venüle — Peripherer Venenkatheter, offen (1,5 mm, weiß, unten) und geschlossen (G18, grün, oben) Peripherer Venenkatheter der Größe 1,3 mm mit halb zurückgezogener Stahl …   Deutsch Wikipedia

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