Fig. 2
ORGANS OF CIRCULATION.—HEART AND LUNGS.
Figure 1.—Front View of Heart and Lungs.—Both organs are stripped of their envelopes, the pleura and pericardium. The right lung is drawn aside, so as to uncover the heart and large vessels. The left lung is deeply dissected, to show the distribution and mode of ramification of the air-tubes and blood-vessels.
Fig. 1
a, The larynx. b, The trachea.—The right lung is somewhat shorter than the left, and is divided into three lobes, c, d, e; while the left lung has but two lobes, f, g. The surface of the lobes is sub-divided into lobules, by the intersection of great numbers of depressed lines. h, Right auricle of the heart. i, Right ventricle. j, Left auricle. k, Left ventricle. l, The aorta. m, The pulmonary artery. n, Left pulmonary veins.—These veins are four in number, two for each lung; and they return to the heart the blood which has been conveyed into the lungs by the pulmonary artery. The division of the pulmonary artery into right and left branches cannot be seen in this figure, being hidden by the aorta. o, The superior vena cava. p, Root of the right innominate artery, springing from the arch of the aorta. q, Root of the left sub-clavian artery. r, Root of the left carotid artery.
Fig. 2
Figure 2.—Back View of the Heart and Lungs.—a, Larynx. b, Trachea. c, Right bronchus. d, Left bronchus. e, Left auricle of the heart. f, Left ventricle. g, Right pulmonary veins. h, Left pulmonary veins. i, Left pulmonary artery. j, Section of the aorta. k, Trunks of the brachio-cephalic veins (those which belong to the arms and head). l, The opening of the inferior vena cava.—The sub-divisions of the pulmonary arteries and veins, and of the air-tubes or bronchi, are seen accompanying each other in the left lung in both figures.