| seasonal spermatogenic cycle and morphology of germ cells in the viviparous lizard mabuya brachypoda (squamata, scincidae). | we describe seasonal variations of the histology of the seminiferous tubules and efferent ducts of the tropical, viviparous skink, mabuya brachypoda, throughout the year. the specimens were collected monthly, in nacajuca, tabasco state, mexico. the results revealed strong annual variations in testicular volume, stages of the germ cells, and diameter and height of the epithelia of seminiferous tubules and efferent ducts. recrudescence was detected from november to december, when initial mitotic a ... | 2012 | 22806886 |
| interembryonic regions of the uterus of the viviparous lizard mabuya brachypoda (squamata: scincidae). | analysis of the structure and physiology of the uterine incubation chambers of viviparous squamates has provided insight concerning adaptations for gestation. however, the literature addressing the biology of the interembryonic regions of the uterus is very limited, presumably because it has been assumed that this area has little role in the development and support of embryos in viviparous squamates. this study was undertaken to examine the histology of the interembryonic regions of mabuya brach ... | 2006 | 16416417 |
| oogenesis in the viviparous matrotrophic lizard mabuya brachypoda. | oogenesis in the lizard mabuya brachypoda is seasonal, with oogenesis initiated during may-june and ovulation occurring during july-august. this species ovulates an egg that is microlecithal, having very small yolk stores. the preovulatory oocyte attains a maximum diameter of 0.9-1.3 mm. two elongated germinal beds, formed by germinal epithelia containing oogonia, early oocytes, and somatic cells, are found on the dorsal surface of each ovary. although microlecithal eggs are ovulated in this spe ... | 2005 | 15959907 |