title: [Spermatogonia types in tepezcuintle (Cuniculus paca). Ultrastructural study].
abstract: Ultrastructural studies of different types of spermatogonia by thin section techniques and transmission electron microscopy showed that Cuniculus paca has two types of Type A spermatogonia (A-O and A-1). Samples were taken at different stages of the cycle in the seminiferous tubule epithelium presented a similar pattern as those of other rodents. Type B spermatogonia are similar to those of the rat, the difference being that the heterochromatic zones are larger and more numerous. Both characteristics differentiate them from preleptotenic spermatocytes.
authors.affiliation: Unidad de Microscopía Electrónica, Universidad de Costa Rica.
authors.forename: F
authors.initials: F
authors.lastname: Ureña
authors.forename: R
authors.initials: R
authors.lastname: Bolaños
authors.forename: N
authors.initials: N
authors.lastname: Rojas
authors.forename: R
authors.initials: R
authors.lastname: Suárez
authors.forename: R
authors.initials: R
authors.lastname: Quesada
mesh_terms: D000818:Animals; D008297:Male; D008854:Microscopy, Electron; D012377:Rodentia; D013093:Spermatogonia / Q000648:ultrastructure*; D013094:Spermatozoa / Q000648:ultrastructure*; D013737:Testis / Q000648:ultrastructure*
vernacular_title: Tipos de espermatogonios en "tepezcuintle" (Cuniculus paca). Estudio ultraestructural.