Apex

An Illustrated Dictionary of Medicine, Biology and Allied Sciences · 1907 · p. 4

(a'-peks). The summit or top of anything; the point or extremity of a cone. A. Beat, the impulse of the heart felt in the fifth intercostal space about 3 inches from the middle of the sternum. A. Murmur, a murmur heard over the apex of the heart. Apices of the Lungs, the upper extremities of the lungs behind the border of the first rib.