Ontogeny of hemopoietic and lymphopoietic tissues in the lizard Chalcides ocellatus (Reptilia, Sauna, Scincidae)
✍ Scribed by Somaya El Deeb; Suher Zada; Dr. Rashika El Ridi
- Book ID
- 102904132
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 904 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0362-2525
No coin nor oath required. For personal study only.
✦ Synopsis
The first and major blood-forming organ to develop in the viviparous lizard Chalcides ocellatus is the yolk sac, which exhibits prominent erythropoietic activity from as early as stage 21 through birth (stage 41). Myeloid cells and megakaryocytes are produced in the yolk sac from stage 23 onward. During lizard embryogenesis hemopoietic activity is also observed in spleen and bone marrow but in neither kidney nor liver. Cells capable of giving rise to lymphocytes both in vivo and in vitro are first found in the thymus at stage 35. Active lymphopolesis in thymus and spleen begins at stages 36 and 39, respectively. In contrast, the gut-associated lymphoid aggregates are not evident before birth.