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[Ultrastructural study of human yolk sac]
Hua Xi Yi Ke Da Xue Xue Bao = Journal of West China University of Medical Sciences = Huaxi Yike Daxue Xuebao
|December 1, 1995
Summary
This electron microscopy study reveals the intricate structure of the human yolk sac, detailing its endoderm, mesenchyme, and mesothelium. It highlights the yolk sac
Area of Science:
- Embryology
- Cell Biology
- Histology
Context:
- The human yolk sac is a transient organ crucial for early embryonic development.
- Understanding its ultrastructure is key to comprehending early organogenesis and hematopoiesis.
Purpose:
- To investigate the ultrastructural morphology of the human yolk sac across different gestation weeks using electron microscopy.
- To characterize the cellular components and their organization within the yolk sac wall.
Summary:
- Electron microscopy revealed the human yolk sac wall comprises endoderm, mesenchyme, and mesothelium.
- Endodermal cells exhibit large nuclei, prominent nucleoli, microvilli, and abundant organelles. Mesenchyme contains fibroblasts, macrophages, erythroblasts, collagen, and capillaries.
- Mesothelial cells feature branched microvilli and frequent pinocytotic vesicles. Endodermal tubules and invaginations into the mesenchyme were observed.
Impact:
- The study provides detailed ultrastructural insights into the human yolk sac's role in early synthesis, secretion, translation, and hematopoiesis.
- This foundational understanding aids research in developmental biology and early pregnancy complications.