Abstract
The anatomy of the normal tricuspid valve reveals its vulnerability to incompetence, especially when it is compared structurally with the mitral valve. Of 21 specimens of rheumatic tricuspid valve disease, 5 possessed well-marked stenosis. In 4 instances, the valve orifice formed a short rigid funnel which was probably incompetent during life. In most cases, the fused commissures were difficult to visualize from the atrial aspect and presumably would have been difficult to feel at valvotomy during life. Eight of the 16 valves with slight or no stenosis were probably incompetent to a considerable degree.

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