Histología y embriología oral clínicamente integradas como herramienta didactica en un curso de grado de la carrera de odontologia / Oral histology and embryology clinically integrated as a teaching tool in an undergraduated dentistry course of studies

The teaching of Oral Histology and Embryology clinically integrated was designed as a pilot experience to be developed during the 2005 academic year at the Division of Histology and Embryology (Chair [quot ]A[quot ]) of the National University of Cordoba School of Dentistry. This experience, in which the members of the faculty of the Department of Clinical and Basic Sciences have an active participation, is based on a systemic conception of the learning-teaching process and on the recommendations made by the OPS/OMS. This approach will allow us to optimize the quality of our undergraduate programs through better teacher training and the gradual integration of basic and clinical sciences. Our aim is to provide a better education with clinical relevance in basic sciences and scientific basis in clinical assistance.

La enseñanza integrada es un modelo pedagógico que se sustenta fundamentalmente en la concentración de los aspectos relevantes de un conjunto de disciplinas interrelacionadas, obteniéndose como producto una síntesis interdisciplinaria, lo que proporciona una visión más holística de la enseñanza y le permite al educando integrar conocimientos. A partir de esta concepción sistémica del proceso de enseñanza/aprendizaje y de las recomendaciones de OPS/OMS, se diseñó como experiencia piloto para el Ciclo Lectivo 2005 de la Cátedra "A" de Histología y Embriología de la Facultad de Odontología perteneciente a la Universidad Nacional de Córdoba, la enseñanza de la Histología y Embriología Oral clínicamente integradas, con activa participación de docentes de Ciencias Básicas y Clínicas. La estrategia para la sistematización de los contenidos de los módulos de aprendizaje se basó en una dinámica que se sustenta en el uso de facilitadores didácticos, que recrean instrumentos didácticos como son las ideas previas, los mapas conceptuales, la resolución de problemas y el estudio de casos clínicos. Esta experiencia nos va a permitir optimizar la calidad de la oferta educativa de grado a través de la mejora de la formación docente y la gradual integración de las ciencias básicas y clínicas, para el logro de una educación con relevancia clínica en las ciencias básicas y con base científica en la asistencia clínica.

Avian minor salivary glands: an ultrastructural study of the secretory granules in mucous and seromucous cells

Ultrastructural descriptions in birds are scarce thus, in this study we have characterized the secretory granules of mucous and seromucous cells from the palatine and lingual salivary glands of birds with different diets. The samples were taken from the tongue and palatine mucosa of chicken (Gallus gallus), quail (Coturnix coturnix), chimango (Milvago chimango) and white heron (Egretta thula). The samples were processed for observation by transmission electron microscopy (TEM) employing 4

Karnovsky solution for fixation. The most noteworthy finding was the heterogeneous ultrastructural appearance of the secretory granules. Differences in substructure were found between the four species, between the palatine and lingual glands in the same species and even within the same acinus and the same cell. At variance with other authors, these differences cannot be attributed to the type of fixative solution used taking into account that all the samples were processed in the same way. Previous histochemical studies have shown the presence of sulfated and non sulfated glycoconjugates in these glands which can be associated to the maturation of the granules. These granules are probably representative of peculiar storage of the secretory products that would give rise to a heterogeneous and complex ultrastructural pattern of granules in the mucosa and seromucosa cells of these avian species.