Piece 13. Block from the ventricular wall at the base of the anterior
papillary muscle for myocardial fibers.
Heart 2 was received from Dr. Carter on April 10, 1917. It was
still warm upon arrival and the gross examination was made at once in
the laboratory.
The h^art is that of a white male (H. T.) of 36 years, who succumbed
to an attack of acute pneumonia. The weight of the organ is 340 gm.
It is of normal size and appearance. The length from root of pul-
monary artery to apex is 97 mm. There is a considerable but not
abnormal amount of fat. Several " milk spots " are visible on both
ventricles. The pericardium is normal. The right and left atria are
of normal size. The wall of the right atrium at the lower end of the
crista measures 4 mm. in thickness : that of the left atrium immediately
above the orifices of the pulmonary valves is 3 mm. thick. The actual
wall of the right ventricle between the papillary muscles is 6 mm. in
thickness, but at least half of this is fat. The diameter of the wall of
the left ventricle in a corresponding situation is 11 mm., only about



6 0. Vun der Stncht and T. Wmgate Todd

1 mm. of this being due to fat. Near the atrio-ventricular junction the
cross-section of the right ventricular wall is 12 mm., 4 mm. of this
being fat, and that of the left ventricle 11.5 mm. (aU muscle) . There
is no apparent endocarditis. All the orifices and valvular cusps in
this heart are of normal size and appearance. The orifices of the
coronary arteries are normal and there is no atheroma of the aorta.
