INVESTIGADORES
ABDALA Virginia Sara Luz
congresos y reuniones científicas
Título:
Sesamoides en anuros: nuevos datos, viejos temas.
Autor/es:
PONSSA LAURA; GOLDBERG JAVIER; ABDALA VIRGINIA
Lugar:
San Salvador de Jujuy
Reunión:
Congreso; X Congreso Argentino de Herpetología; 2009
Institución organizadora:
Asociación Argentina de Herpetología
Resumen:
Sesamoids are skeletal elements rarely considered in studies of the vertebrate skeleton. In this work we integrate ontogenetic data of anuran sesamoids in two species (Leptodactylus latinasus and Pleurodema cf. guayapae), the related structures (tendons, muscles, joints) in L. latinasus, and a survey of sesamoid distribution in 186 anuran taxa. Our main goals are (1) to contribute to the knowledge of the comparative anatomy of sesamoids in tetrapods; (2) to provide additional developmental evidence in order to interpret the ontogenetic pattern of sesamoids in anurans, as a key to elucidate that of tetrapods in general; (3) to provide data about tendon development in relation to sesamoid development in anurans for the first time; and (4) to propose a pattern of anuran sesamoid distribution. The homologies of sesamoids across tetrapods are discussed here. Observations were made in cleared and stained skeletal whole-mounts. Fifty-four sesamoids were found in anurans, thirty-seven of which occur in Leptodactylus latinasus. The traditional point of view of embedded sesamoids always resulting from biomechanical stimuli of a previously existing tendon is not sustained by our data. Many sesamoids arise before the differentiation of a tendinous tissue. The similarity in origin, shape and conformation of both sesamoid and lateral articular cartilages (apophyses or traction epiphyses) of the long bones strongly support the old sesamoid-traction-epiphysis hypothesis.