bronchiole

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bronchiole

 [brong´ke-ōl]
one of the successively smaller channels into which the segmental bronchi divide within the bronchopulmonary segments. adj., adj bronchi´olar.
respiratory b's the final branches of the bronchioles, communicating directly with the alveolar ducts; they are subdivisions of terminal bronchioles, have alveolar outcroppings, and themselves divide into several alveolar ducts.
Respiratory bronchiole. From Dorland's 2000.
( and see color plates.)
terminal bronchiole the last portion of a bronchiole that does not contain alveoli, i.e., one whose sole function is gas conduction; it subdivides into respiratory bronchioles.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

bron·chi·ole

(brong'kē-ōl), [TA]
One of approximately six generations of increasingly finer subdivisions of the bronchi, all smaller than 1 mm in diameter, and having no cartilage in its wall, but relatively abundant smooth muscle and elastic fibers.
Synonym(s): bronchiolus [TA]
Farlex Partner Medical Dictionary © Farlex 2012

bronchiole

(brŏng′kē-ōl′)
n.
Any of the fine, thin-walled, tubular extensions of a bronchus.

bron′chi·o′lar (-ō′lər) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

bronchiole

A conducting airway which begins at the last cartilaginous plate and ends at the last ciliated epithelial cell; bronchioli are any of 7–9 increasingly finer subdivisions of the bronchiolar tree (BT), measuring < 1 mm in diameter. In the distal BT, the respiratory epithelium becomes flatter, the ciliated cells fewer in number, the mucous glands less prominent and eventually disappear and, in the purely respiratory bronchioles, cuboidal nonciliated non-mucus-producing Clara cells appear.

Bronchiole types 
Respiratory bronchiole bronchiolus respiratorius MNA6
Any of 1–3 generations of ≤ 0.5-mm airways that connect terminal bronchioli to the alveolar ducts. Alveoli arise directly from the wall of RBs; the most distal RB is histologically characterised by an air space lined on one side by respiraotory epithelium and on the other by alveoli.
 
Terminal bronchiole bronchiolus terminalis NA6
Any of ±6 generations of purely conducting—i.e., nonrespiratory bronchioles—which connect; rare direct connections between TBs and alveoli may be seen, known as Lamberth’s canals.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

bron·chi·ole

(brong'kē-ōl)
One of approximately six generations of increasingly finer subdivisions of the bronchi, each smaller than 1 mm in diameter, and having no cartilage in its wall, but relatively abundant smooth muscle and elastic fibers.
Synonym(s): bronchiolus [TA] .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

bronchiole

One of the many thin-walled, tubular branches of the bronchi, which extend the airway to the terminal air sacs (alveoli). Bronchi have cartilaginous rings, bronchioles do not.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

bronchiole

one of the smaller tubes branching off the two main bronchii in the lungs of higher vertebrates. See BREATHING and Fig. 81 .
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Bronchiole

A thin air passage in the lung that branches off a larger airway.
Mentioned in: Bronchiolitis
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

bron·chi·ole

(brong'kē-ōl)
One of approximately six generations of increasingly finer subdivisions of the bronchi, all smaller than 1 mm in diameter.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The function of the goblet/Clara cell as lung epithelial stem and progenitor cells in the renovation of the bronchiolar epithelium in the mammals was well defined in some investigations [22,23].
I: Bronchiolar epithelial reorganization and expression of cytochrome P450 monooxygenases in mice exposed to multiple doses of naphthalene.
Cysts are not a predominant feature of either disease and usually arise late in presentation as result of the ball valve effect from bronchiolar stenosis.
Exposure to IR/and or PQ induced degenerative changes in the bronchiolar epithelium identified by the presence of fragments of cells and small dark nuclei, thickened edematous bronchiolar walls infiltrated with round cells, some small muscular arterioles showed medial hypertrophy in the presence of focal alveolar emphysema (Fig.
Lungs showed 52.85% of Grade IV changes, i.e., very severe degree changes of alveolar oedema, haemorrhage, bronchiolar haemorrhage, interstitial haemorrhage, congestion and inflammation.
The viral infection starts in the upper respiratory tract and spreads to the lower tract within a few days, resulting in inflammation of the bronchiolar epithelium and oedema of the submucosa and adventitia.
(28,29) Inflammation is followed by the formation of loose nonnecrotizing epitheliod cell granulomas in the bronchiolar wall and alveolar ducts.
Constrictive bronchiolitis (CB) is a lung disease characterized by fixed airways obstruction and fibrosis of the distal airways or bronchioles, with extrinsic narrowing or obliteration of the bronchiolar lumen.
(19),(20) Mini-plasmin is found in folded epithelial cells, in the relatively thick superior bronchiolar divisions; tryptase Clara is located in Clara cells of the inferior bronchiolar divisions, such as the terminal and respiratory bronchioles; and ectopic trypsin I is distributed in stromal cells of peri-bronchiolar regions.
(2) Early in the disease course, the offending cells are abundant in proximal bronchial and bronchiolar epithelium.