Bronchiole
Diagram of the alveoli with both cross-section and external view.
Gray's	subject #240 1098

The bronchioles or bronchioli are the first airway branches that no longer contain cartilage. They are branches of the bronchi. The bronchioles terminate by entering the circular sacs called alveoli.

Control of airflow resistance and air distribution in the lungs is controlled by the bronchioles.

[edit] Pathology

Bronchospasm, a life-threatening situation, occurs when the smooth muscular tissue of the bronchioles constricts, severely narrowing their diameter. Bronchospasm is commonly treated by oxygen therapy and bronchodilators.

The medical condition of inflammation of the bronchioles is termed bronchiolitis. Diseases of the bronchioles include asthma, bronchiolitis obliterans, respiratory syncytial virus infection, and influenza.

[edit] Additional images

Cross sectional cut of primary bronchiole

Bronchi, bronchial tree, and lungs

1. Trachea 2. Mainstem bronchus 3. Lobar bronchus 4. Segmental bronchus 5. Bronchiole 6. Alveolar duct 7. Alveolus

[edit] External links

• Histology at BU 13607loa

v • d • e Anatomy: lower respiratory system (TA A06.3-5, GA 11.1084) Lower RT Trachea Tracheal rings · Annular ligaments of trachea · Carina Lungs Surface right/left · apex/base/root/hilum · cardiac impression/cardiac notch/lingula borders (anterior, posterior, inferior) surfaces (costal, mediastinal, diaphragmatic) fissures (oblique, horizontal) Airway Conducting zone bronchi · main bronchus (right, left) · lobar/secondary bronchi (eparterial bronchus) · segmental/tertiary bronchi (bronchopulmonary segment) · bronchiole · terminal bronchiole Respiratory zone respiratory bronchiole · alveolar duct · alveolus · alveolar-capillary barrier respiratory system navs: anat nose,larynx/lower+thoracic cavity/physio/dev, noncongen/congen/tumors, symptoms+signs/eponymous, proc