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Thorax (2)

Thoracic Cavity

Compartments of the Thoracic Cavity (1) Two Lateral compartments--the Pulmonary Cavity; Right and left pulmonary cavities contain lung and pleural
Compartments of the Thoracic Cavity (2) One central compartment--the mediastinum contains all other thoracic structures: heart, great vessels, trachea, esophagus, thymus, and lymph nodes
Pleurae double-layered membrane covering each lung and lining each (right and left) of the pulmonary cavity
Visceral pleura membrane adherent to each lung
Parietal pleura Four parts: Costal part, mediastinal part, diaphragmatic part, and cervical pleura
Pleural cavity virtual space btw two layers of pleura; contains thin film of serous (clear) film; surface tension of fluid provides cohesion that keeps the lung surface in contact with thoracic wall
Lungs Vital organs of respiration bring blood into close relation with air for gas exchange; tissue is light, soft and spongy; recoil to approx. ⅓ their size when release from pleura
Components of the Lung: Apex blunt superior end ascending above clavicle and 1st rib (top, pointiest part of lung)
Components of the Lung: Base concave inferior surface opposite the apex, resting on diaphragm
Components of the Lung: Left Lung two lobes and Right lung: thRee lobes; lobes are separated by fissures
Components of the Lung: Three Surfaces costal mediastinal, diaphragmatic
Components of the Lung: Three Borders anterior, inferior and posterior
Components of the Lung: Root bronchi, pulmonary arteries and veins, pulmonary nerves (sympathetic, parasympathetic and visceral afferent), and lymphatic vessels pass
Components of the Lung: Root-Hilum wedge-shaped area through which root passes
Trachea from inferior larynx to sternal angle
Main Bronchi division of trachea into right and left airways that each enter a lung at its hilum; Cartilaginous “rings” keep airway open at all times
Right Bronchi wider, shorter and runs more vertically than left
Left Bronchi passes inferolaterally, inferior to arch of aorta and anterior to esophagus
Conducting bronchiole 20-15 generations of branching; lack cartilage; smooth muscle largest component of walls; terminal bronchioles: smallest of conducting bronchioles
Respiratory bronchioles several generations from each terminal bronchiole; each end in cluster of alveolar sacs
Pulmonary alveolus basic structural unit of gas exchange in lungs
Created by: vzapanta



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