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.

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]

bronchiole

/bron·chi·ole/ (brong´ke-ōl) one of the finer subdivisions of the branched bronchial tree.
respiratory bronchioles  the final branches of the bronchioles.

bronchiole

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

bron′chi·o′lar (-ō′lər) adj.

bronchiole

[brong′kē·ōl]
Etymology: L, bronchiolus, little windpipe
a small airway of the respiratory system extending from the bronchi into the lobes of the lung. There are two divisions of bronchioles: The terminal bronchioles passively conduct inspired air from the bronchi to the respiratory bronchioles and expired air from the respiratory bronchioles to the bronchi. The respiratory bronchioles function similarly, allowing the exchange of air and waste gases between the alveolar ducts and the terminal bronchioles. bronchiolar [brongkē′ələr] adj.
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Bronchioles

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.

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] .

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.

bronchiole

one of the smaller tubes branching off the two main bronchii in the lungs of higher vertebrates. See BREATHING and Fig. 81 .

Bronchiole

A thin air passage in the lung that branches off a larger airway.
Mentioned in: Bronchiolitis

bronchiole

subdivision of a bronchus

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.

bronchiole (brong´kēōl),

n a terminal division of a bronchium.

bronchiole

one of the successively smaller channels (1 mm or less) into which the bronchi divide.

respiratory bronchiole
the final branch of a bronchiole, communicating directly with the alveolar ducts; a subdivision of a terminal bronchiole, it has alveolar outcroppings and itself divides into several alveolar ducts.
References in periodicals archive ?
And, finally, there were increased collagen fibres due to hyperproliferation of fibroblasts in addition to mononuclear cell infiltration around the terminal bronchioles (Figure-10).
Cromolyn stabilizes bronchiole mast cells and inhibits release of inflammatory mediators.
In primates, lymphatic vessels exist at the alveolar level adjacent to the respiratory bronchioles (20,21).
In classic cases of UIP, the cystic bronchioles should be lined by respiratory ciliated epithelium, but in a subset of cases, the cysts of diffusely fibrotic lungs are instead lined by cuboidal epithelium.
Based on this sample power, an analysis was done to score for changes within each of these three generations of respiratory bronchioles from each case for the following histologic features: smooth muscle hypertrophy, fibrosis, alveolar macrophage frequency, degree of inflammatory change within the interstitial wall, amount of carbonaceous pigment within each respiratory bronchiole generation, and the amount of birefringent dust particles within each of these generations.
9) However, studies based on lung cancer resection specimens have shown that fine fibrosis in the alveolar walls around respiratory bronchioles is in fact very common in the lungs of cigarette smokers who have no clinical evidence of an ILD.
68,71,72) Histologically, bronchiolar lumen contain purulent exudative material and sloughed bronchiolar mucosal cellular debris and variable amounts of mucus, and bronchiole mucosa and walls contain a mixed neutrophilic infiltrate and chronic inflammatory cell infiltrate made up predominantly of lymphocytes and plasma cells.
1) The CAP criteria require "discrete foci of fibrosis in the walls of respiratory bronchioles associated with accumulations of asbestos bodies in histological sections.
Some of the bronchioles and adjacent alveoli walls also demonstrated a mild chronic interstitial inflammatory infiltrate as well as interstitial fibrosis and hyperplasia of the overlying alveolar epithelial cells.
The main functions of the fetal lung are to produce amniotic fluid and a material called surfactant that reduces the surface tension of the fluids that line the bronchioles and alveoli.
Using n3D technology, however, researchers were able to magnetically levitate bronchiole tissue to the air-liquid interface so that airborne toxins can be exposed to the epithelial layer of the tissue, just as would occur in human lungs.