Anatomy of the septomarginal trabecula in goat hearts.

Our aim in this study was to examine the right septomarginal trabecula of goats regarding the frequency, origin course of the septal and free component, attachment to the papillaris magnus muscle and size . The material used consisted in 32 hearts from non-pedigree goats of both sexes, preserved in 10% formalin. The right septomarginal trabecula was present in all hearts. It could also present a prominence in the form of a cord in the septum before detaching and going towards the wall or the papillary muscle. We called this a septal component and found it in 69% of all hearts studied. In the remaining specimens, the exit of the septomarginal trabecula was abrupt, without presenting a septal component. It could be attached solely to the papillaris magnus muscle or to the papillary muscle and the ventricle wall, originated in the cranial third of the septum, and was attached to the middle third of the papillary muscle or its caudal third. Its free part, from the septum to the papillaris magnus muscle, ranged in length from 1.3 cm to 2.6 cm. The mean value was 1.7 cm, and the most frequent values were 1.9 and 1.5 cm. In conclusion, in goats, the septomarginal trabecula is a constant and invariable structure.

Ausencia de inserción de las cuerdas tendinosas en los músculos papilares del ventrículo derecho de la cabra / Tendinous chords not inserted in the papillary muscles of the right ventricle of goats

A menudo se describe que la trabécula septomarginal derecha del corazón de las cabras presenta cuerdastendinosas. Sin embargo, en nuestras disecciones este no es un hallazgo frecuente en otras especies animales y elpresente trabajo se diseño para comprobar si las cuerdas tendinosas en esta especie se originan directamente deltabique interventricular. El material utilizado fueron 32 corazones de cabras de ambos sexos, de raza mestiza,conservados en formol al 10%. El ventrículo derecho se abrió mediante un corte en el punto central del troncopulmonar y continuando a través del cono arterioso hasta el borde derecho. Nuestros resultados mostraron que68,8% de los corazones presentaban al menos una larga cuerda tendinosa saliendo de la trabécula septomarginal.El origen fue predominantemente en el tercio de la trabécula cerca del tabique (58,3%), destinadas a la valvaseptal y fi jas en su borde libre (87,5%). La presencia de cuerdas tendinosas originándose directamente del ladoderecho del tabique interventricular se observó en 59,4% de los corazones. Estas son cortas aunque predominanen la región craneodorsal del tabique interventricular (76,7%). Ellas se fi jan a la valva septal (96,8%) y estándestinadas al borde libre (80%). La presencia de cuerdas tendinosas en la trabécula septomarginal no tienerelación con la presencia o ausencia de las cuerdas tendinosas en el tabique(AU)

The right septomarginal trabecula in goats frequently presents tendinous chords emerging from it. Sincewe had not observed such great occurrences in any other animal in which we had investigated the trabecula,we decided to conduct this study with the aim of establishing possible relationships with tendinous chords thatemerge directly from the interventricular septum. The material used consisted of 32 hearts from non-pedigreegoats of both sexes, conserved in 10% formalin. The right ventricle was opened by means of an incision startingat the central point of the pulmonary trunk and continuing through the arterial cone to the right margin. Ourresults demonstrated that 68.8% of the specimens presented at least one long tendinous cord emerging fromthe septomarginal trabecula. This emergence occurred predominantly in the third of the trabecula closest to theseptum (58.3%) and the cord headed to the septal cusp and attached to its free margin (87.5%). The presence oftendinous chords emerging directly from the right side of the interventricular septum was found in 59.4% of thespecimens. These were short, because they were predominantly in the craniodorsal region of the interventricularseptum (76.7%). They attached to the septal cusp (96.8%) and headed for the free margin (80%). The presenceof tendinous chords in the septomarginal trabecula was unrelated to the presence or absence or tendinous chordsin the septum(AU)