DESCRIPTION OF PLATE 23.
A. Upper end of the sternum.
B B.* First pair of ribs.
C C.* Second pair of ribs.
D. Aorta, with left vagus and phrenic nerves crossing its transverse arch.
E. Root of pulmonary artery.
F. Right ventricle.
G. Right auricle.
H. Vena cava superior, with right phrenic nerve on its outer border.
I I*. Right and left lungs collapsed, and turned outwards, to show the heart’s outline.