N N. Fifth ribs.
O O. Collapsed lungs.
P P. Arching diaphragm.
Q. Subclavian artery.
R. Common carotid artery, at its division into internal and external carotids.
S S. Great pectoral muscles.
T T. Lesser pectoral muscles.
U. Mediastinal pleura of right side.
V. Right auricle of the heart.
