The Morphological Studies of the Cardiac Position in Rhesus Monkeys
1973 Volume 6 Issue 6 Pages 27-34
Details
1973 Volume 6 Issue 6 Pages 27-34
Six female Rhesus monkeys, 7-9 years old and 4.0-7.5 kg in body weight, were used for research on the thoracic morphology and the cardiac position in the thorax by gross anatomical studies and X-ray observations.
The results were as follows;
1. The thoracic index in Rhesus monkeys are about 115-125. The shape of the thorax in the Rhesus monkey is more similar to that of dogs' than that of mans'.
2. The cardiac axis inclines at 35°to the sagittal plane from the ventral view, and 25°to the sternum from the lateral view.
3. The heart is located between the third rib and the sixth intercosta. The cardiac position in the thorax shows almost no change according to changes of physical conditions or the movement of the forelimb, from X-ray observations.
4. The perpendicular line to the horizontal plane and parallel to the sagittal plane from both nipples run through the right and left ventricles in all cases. Also the position of the nipples shows almost no change as with the cardiac position.
Therefore, it is presumed that the nipples are standard points for determining the cardiac position from the surface of the chest.
