[Anatomy of the right atrioventricular valve (valva atrio-ventricularis dextra or valva tricuspidalis). Description of a new type of chordae: the mixed chordae].

The authors, continuing their work concerning the tricuspid valve which was communicated at the Fourth European Anatomical Meeting (Bále, 1977), now present a study of twenty anatomical preparations according to the Mac ALPINE technique of perfusion-fixation, giving to the preparation a morphology comparable to that of the heart at the end of the diastole. The present work consists in a descriptive and morphological study of one type of tendinous cord, not described until now, and denominated mixed cord. It defines itself by its valvular insertions which are situated on the four areas of the tricuspid valve described by SILVER and al. It is a cylindric tendinous cord, always ramified either into two branches which are in turn greatly ramified, or into a fan shaped spreading. Each ramification is attached to the valve by an expansion which is either perpendicular or parallel to the ring. This work specifies: the number of tendinous cords, their distribution to the three cusps of the tricuspid valve, the number of their ramifications and their valvular insertions.