acinus


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acinus

 [as´ĭ-nus] (pl. a´cini) (L.)
any of the smallest lobules of a compound gland.
liver acinus the smallest functional unit of the liver, a mass of liver parenchyma that is supplied by terminal branches of the portal vein and hepatic artery and drained by a terminal branch of the bile duct.
 Liver acinus: Hepatic lobules are represented by hexagons (solid lines); liver acinus is represented by rhombus (dotted line). From Dorland's, 2000.
pulmonary acinus terminal respiratory unit.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ac·i·nus

, gen. and pl.

ac·i·ni

(as'i-nŭs, -nī), [MIM*604562]
One of the minute grape-shaped secretory portions of an acinous gland. Some authorities use the terms acinus and alveolus interchangeably, whereas others differentiate them by the constricted openings of the acinus into the excretory duct.
[L. berry, grape]
Farlex Partner Medical Dictionary © Farlex 2012

acinus

(ăs′ə-nəs)
n. pl. aci·ni (-nī′)
One of the small saclike dilations composing a compound gland.

a·cin′ic (ə-sĭn′ĭk), ac′i·nous adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

acinus

A small, sac-like out-pouching of a compound gland, as in the breast, pancreas, salivary glands and thyroid.

Lung
A sub-segmental lung structure which, with the primary pulmonary lobule, is the smallest unit of lung tissue. It consists of a terminal bronchiole and the lung parenchyma that arises from it.

Acinus

A subsegmental lung structure which, with the primary pulmonary lobule, is the smallest unit of lung tissue. It consists of a terminal bronchiole and the lung parenchyma that arises from it
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ac·i·nus

, pl. acini (as'i-nŭs, -nī) [TA]
One of the minute grape-shaped secretory portions of an acinous gland. Some authorities use the terms acinus and alveolus interchangeably, whereas others differentiate them by the constricted openings of the acinus into the excretory duct.
[L. berry, grape]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

acinus

1. The part of the air passage of the lung beyond each of the smallest (terminal) bronchioles. There are about 12,000 acini in each lung. The lung ALVEOLI arise from the acini.
2. Any terminal sac-like process of a compound gland.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

acinus

the terminal sac of an alveolar gland. The gland has a multicellular structure with sac-shaped secreting units. In the pancreas, acinar cells secrete the PANCREATIC JUICE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

ac·i·nus

, pl. acini (as'i-nŭs, -nī) [TA] [MIM*604562]
One of the minute grape-shaped secretory portions of an acinous gland.
[L. berry, grape]
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Rosgen, "Three-dimensional convective alveolar flow induced by rhythmic breathing motion of the pulmonary acinus," Journal of Biomechanical Engineering, vol.
Control group parotid gland results revealed that it had normally parenchyma and stroma with serous acinus, duct and connective tissue structures.
For male acini, germinal cells sat within the inner wall of the acinus, with spermatocysts, spermatids, and spermatozoids developing toward the lumen.
Rigid arches and punched-out space involving a single acinus in keeping with atypical ductal hyperplasia (hematoxylin-eosin, original magnification X40).
From the centre of such a bronchiole, a perpendicular was dropped to the edge of the Acinus (Connective tissue septum or pleura), and the number of alveoli cut by this line was then counted.
Following spawning, some oocytes of both types may remain in the acinus; these are termed residual oocytes.
Furthermore, this region is the point of entry and exit to the ventilatory unit; gases and airborne particles entering and leaving the acinus have to pass through this constricted zone.
In the male gonad, spermatogonia, spermatocytes, spermatids, and sperm were located in series from the basal membrane of the acinus to its center (Fig.
What is the "end-stage" of the acinus? When the alveolated structures are lost, a distorted ectatic terminal bronchiole, lined by bronchiolar epithelium, is left, which is why the changes of UIP are dominantly subpleural or periseptal, because this is where distal lung acini terminate.
The minimum physiological parenchymal unit of a salivary gland is referred to as a salivon which consists of an alveolus or acinus.