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Ⅴ. Lung:
Position: located in the thoracic cavity, both sides of the mediastinum, above the diaphragm
External features: an apex a base 2 surfaces— mediastinal and costal surfaces 3 borders– anterior border, inferior border, posterior border
Fissures and lobes of the lungs: left lung – 2 lobes ( by oblique fissure)
superior lobe (lingula)
inferior lobe
right lung – 3 lobes
(by oblique and
horizontal fissures):
superior lobe
middle lobe,
inferior lobe
Hilum of lungs (medial view of the lungs)
It is the center part of mediastinal surface. The arrangement of main structures as follows:
from anterior to posterior--- pulmonary v., pulmonary a., main bronchus (both sides)
from superior to inferior--- right lung– bronchus of sup. lobe, left lung– pulmonary a., pulmonary a., main bronchus, bronchus of inf. lobe, pulmonary v. pulmonary v.
The structures of the lung: two parts
--- bronchial tree:
principal bronchus---
lobar bronchi---segmental
bronchi--- bronchioles---
terminal bronchioles
--- alveoli of the lung:
The Segments of the lung: bronchopulmonary segments
Ⅵ. The Pleura and pleural cavities: The definition The Parts:
Visceral pleura Parietal pleura---- Cupula Costal pleura Mediastinal pleura Diaphragmatic pleura
The pleural cavity and pleural recess : a potential space, contains a few of serous fluid; 2 pleural cavities are separated from each other by the mediastinum; They are negative pressure (to the atmospheric pressure).
costodiaphragmatic recess
Ⅴ. Mediastinum:
The definition
The divisions:
4 parts
3 parts
The containts: from
the left side
the right site right view
Left view