. Cunningham's Text-book of anatomy. Anatomy. 1092 THE EESPIEATOEY SYSTEM. The foetal lung differs in a marked degree from the lung of an individual who has breathed. After respiration is fully established, the lung soon comes to occupy almost the whole space allotted to it in the pleural cavity; in the foetus, on the other hand, the lung is packed away at the dorsal aspect, and occupies a relatively much smaller amount of space in the thoracic cavity. Further, it is firm to the touch, and sinks in water. It is only when air and an increased supply of blood are Recurrent nerv Inferior thyreoid
. Cunningham's Text-book of anatomy. Anatomy. 1092 THE EESPIEATOEY SYSTEM. The foetal lung differs in a marked degree from the lung of an individual who has breathed. After respiration is fully established, the lung soon comes to occupy almost the whole space allotted to it in the pleural cavity; in the foetus, on the other hand, the lung is packed away at the dorsal aspect, and occupies a relatively much smaller amount of space in the thoracic cavity. Further, it is firm to the touch, and sinks in water. It is only when air and an increased supply of blood are Recurrent nerv Inferior thyreoid vein -^^ >1 Sterno-hyoid muscle Sterno-thyreoid muscle Sterno-mastoid muscle Thyreoid gland Internal jugular vein Phrenic nerve Scalenus anterior Right vagus nerve Bifurcation of inno ruinate artery Right subclavian vessels Internal mammary arteryjg Right inno- minate vein Right lobe of thymus. Superior lobe of right lung ian artery (left) eft vagus nerve ubclavian vein (left) Common carotid artery Left innominate vein First rib Aortic arch Left lobe of thymus Basal lobe of right lung —If- Pulmonary fissure — Pericardium Fig. 868.—Dissection of Thorax and Root of the Neck from the front to show the relations of the Lungs, Pericardium, and Thymus. introduced into the lung that, it assumes the soft spongy and buoyant qualities which are characteristic of the adult lung. Form of the Lungs.—The lungs are accurately adapted to the walls of the pleural chambers in which they are placed, and in the natural state they bear on the surface impressions and elevations which are an exact counterpart of the irregularities on the walls of the cavity in which they lie. When care has been taken to harden it in situ, each lung presents for examination an apex, diaphragmatic, mediastinal, and costal surfaces, and ventral (anterior) and inferior borders. The apex pulmonis is blunt and rounded, and rises above the level of the oblique first costal arch to the full height of the cupula p
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