acinus
One of the minute grape-shaped secretory portions of an acinous gland. Some authorities use the terms a. and alveolus interchangeably, whereas others differentiate them by the constricted openings of the a. into the excretory duct. [L. berry, grape]
- liver a. a functional unit of the liver, comprising all of the liver parenchyma supplied by a terminal branch of the portal vein and hepatic artery; typically involves segments of two lobules lying between two terminal hepatic venules. SYN: Rappaport a..
- pulmonary a. that part of the airway consisting of a respiratory bronchiole and all of its branches. SYN: primary pulmonary lobule, respiratory lobule.
- Rappaport a. SYN: liver a..

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aci·nus 'as-ə-nəs, ə-'sī- n, pl aci·ni -.nī any of the small sacs or alveoli that terminate the ducts of some exocrine glands and are lined with secretory cells

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n. (pl. acini)
1. a small sac or cavity surrounded by the secretory cells of a gland. Some authorities regard the term as synonymous with alveolus, but others distinguish an acinus by the possession of a narrow passage (lumen) leading from the sac.
2. (in the lung) the tissue supplied with air by one terminal bronchiole. emphysema is classified by the part of the acinus involved (i.e. centriacinar, panacinar, or periacinar).
acinous adj.

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ac·i·nus (asґĭ-nəs) pl. aґcini [L. “grape”] a small saclike dilation, particularly in the lung or a gland. See also alveolus.

Medical dictionary. 2011.

Look at other dictionaries:

  • acinus — [ asinys ] n. m. • 1865; lat. sc. 1689; mot lat. « grain de raisin, baie » ♦ Anat. Petite cavité glandulaire en cul de sac et arrondie, se déversant dans un canal excréteur. Des acinus ou des acini. Le pancréas, les glandes salivaires sont des… …   Encyclopédie Universelle

  • Acinus — Ac i*nus ([a^]s [i^]*n[u^]s), n.; pl. {Acini}. [L., grape, grapestone.] 1. (Bot.) (a) One of the small grains or drupelets which make up some kinds of fruit, as the blackberry, raspberry, etc. (b) A grapestone. [1913 Webster] 2. (Anat.) One of… …   The Collaborative International Dictionary of English

  • Acĭnus — Acĭnus, Drüsenbläschen, s. Drüsen …   Meyers Großes Konversations-Lexikon

  • Acinus —   [lateinisch »Weinbeere«] der, /...ni, kleinste Einheit oder Endabschnitt drüsiger Organe (Speicheldrüsen, Leber) …   Universal-Lexikon

  • ACINUS — Bohemiae fluv …   Hofmann J. Lexicon universale

  • acinus — ACÍNUS s.m. v. acin. Trimis de LauraGellner, 13.09.2007. Sursa: DN …   Dicționar Român

  • ACINUS — (лат. ягода, преимущественно виноградная), выделительный концевой отдела цинозных (иначе альвеолярных, гроздевидных) желез, имеющий форму б. или м. округлого или овоидного пузырька (в противоположность вытянутому в виде трубочки концевому отделу… …   Большая медицинская энциклопедия

  • acinus — àcinus m DEFINICIJA anat. 1. elementarna jedinica žlijezda s vanjskim lučenjem 2. proširenje na kraju plućnih alveola ETIMOLOGIJA lat.: bobica (osobito grožđa) …   Hrvatski jezični portal

  • acinus — [as′i nəs] n. pl. acini [as′inī΄] [ModL: see ACINIFORM] Anat. one of the small sacs of a compound or racemose gland acinous [as′inəs] adj. acinose [as′inōs΄] …   English World dictionary

  • Acinus — De façon générale le terme acinus (du latin acinus, grain de raisin ; au pluriel acini ou acinus) désigne une cavité épithéliale arrondie bordée par des cellules secrétrices qui débouche dans le canal excréteur d une glande. Sommaire 1 Types …   Wikipédia en Français

  • Acinus — Infobox Anatomy Name = Acinus Latin = GraySubject = GrayPage = Caption = Illustrated section of pancreas of dog. X 250. (Alveolus labeled at center top.) Caption2 = Centroacinar cells System = MeshName = MeshNumber = DorlandsPre = DorlandsSuf =… …   Wikipedia

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