COMPARATIVE SPLENIC STRUCTURE OF EUPHRACTINI FROM BAHIA BLANCA ZONE

GALÍNDEZ EJ.; ESTECONDO S.; CASANAVE. EMMA B.

Facultad de Ciencias Veterinarias Universidad Nacional de La Plata, ARGENTINA

Congreso; IX NATIONAL CONGRESS OF MORPHOLOGICAL SCIENCES (9º Congreso Nacional de Ciencias Morfológicas); 2004

Sociedad Argentina de Ciencias Morfológicas

24. COMPARATIVE SPLENIC STRUCTURE OF EUPHRACTINI FROM BAHIA BLANCA ZONE Galíndez EJ1, Estecondo S1, Casanave EB2. 1,2UNS, Dpto. Biol., Bioq. y Fcia., San Juan 670, Bahía Blanca; 1Cát. de Histología Animal, E-mail: galindez@criba.edu.ar; 2Cát. Fisiología Animal; 2CONICET, E-mail: casanave@criba.edu.ar The spleen is a myeloid organ interposed in the systemic circulation. From Agnates, where it is essentially myeloid, the structure has been remodelate because of the evolutive pressure and adaptation to diverse environments. Mammals are excellent models for different structural patterns and Dasypodidae show a splenic morphology that reflects not only their phylogenetic position but also their biology. In this work we compare the histology and cytology of the spleen of Chaetophractus villosus, C. vellerosus and Zaedyus pichiy. The material comes from adult healthy animals. The spleen was collected, weighted and processed according routine techniques. Results show that these species have some basic similitude as an extensive capsulo-trabecular system, the typical pulp segregation and the persistence of myelopoietic activity in adults. Principal differences are focused in the quantity and functionality of ellipsoids, in the presence of isolated contractile cells located between filtrant beds and in the activity degree of mielopoiesis. The splenic architecture of Euphractini here exposed, agrees with the one of other ancestral mammals, but with some adaptative patterns. Supported by SGCyT, UNS, n°: 24/B086. BIOCELL 28(2), 2004