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Term 1 lecture 5 lungs Moodle.pdf

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B2050/2051: Human anatomy and Embryology Lecture 5: Lungs and lung development Most of the human respiratory system is involved in carrying air to or from the respiratory surface Respiratory surfaces – for gas exchange – must be: ã large (large surface to volume ratio) ã wet ã well supplied with blood ã thin ã aerated (open to a source of oxygen) The thorax is divided into two pleural cavities by a central wall of tissue (mainly consisting of the heart + fat + great vessel
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  B2050/2051: Human anatomy and Embryology Lecture 5: Lungs and lung development  Most of the human respiratory system is involved in carrying air to or from the respiratory surface Respiratory surfaces  –  for gas exchange  –  must be: ã  large (large surface to volume ratio) ã  wet ã  well supplied with blood ã  thin ã  aerated (open to a source of oxygen)  The thorax is divided into two pleural cavities by a central wall of tissue (mainly consisting of the heart + fat + great vessels + remnants of thymus)  –  called the MEDIASTINUM This can also be seen in transverse section Mediastinum Pleural cavities  Each of the lungs lies within a separate pleural cavity. This reaches above the clavicle in the neck and well down to the lower margin of the rib cage at the back. At the lower margin of the thorax, there is a gap between the base of the lung and the base of the pleural cavity. This is the costodiaphragmatic recess  –  into which the lungs can slide when fully inflated. Costodiaphragmatic recess
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