Figure 11
From: Placentation in Sigmodontinae: a rodent taxon native to South America
Ultrastructure of the visceral yolk sac in mid gestation. (A) Euryoryzomys (MAV/SJB 02). The endoderm possessed apical microvilli (arrows) and basal nuclei (N). They were close to the vitelline capillaries (VC). (B) Necromys (MZUSP/APC 1246-3). Rough endoplasmic reticulum (RER) and vacuole-like vesicles (VV) in the cytoplasm. (C) Necromys (MZUSP/APC 1246-3). Electron-dense inclusions (D). (D) Euryoryzomys (MAV/SJB 02). Glycogen deposits (Gly), endocytic vesicles (EV) and large intracellular spaces (ICS) were evident in the apical cytoplasm. (E) Necromys (MZUSP/APC 1246-3). An endothelial cell of a vitelline capillary with fenestrated regions (arrows). (F) Necromys (MZUSP/APC 1246-3). Higher magnification.