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[The gastric mucosa of the human fetus. I. The surface epithelium]
1Istituto di Anatomia umana normale, Università di Sassari.
Insights
The gastric mucosa develops from simple pseudostratified epithelium to specialized surface mucous cells between the 7th and 12th weeks of gestation. This study details the key morphological changes during early human gastric development.
Area of Science:
- Gastroenterology
- Developmental Biology
- Histology
Context:
- The early development of the human stomach is crucial for establishing digestive function.
- Understanding the ontogenesis of the gastric mucosa provides insights into congenital anomalies and diseases.
Purpose:
- To investigate the morphological differentiation of the gastric surface epithelium during early human fetal development.
- To characterize the cellular changes from undifferentiated epithelium to mature surface mucous cells.
Summary:
- Light and electron microscopy were used to examine 41 human fetuses (7-12 weeks gestation).
- Initially, a simple pseudostratified epithelium with glycogen-rich cells was observed.
- By 12 weeks, distinct gastric foveolae formed, and surface cells differentiated into mucous cells, characterized by nuclear basalization and glycogen replacement by mucus granules.
Impact:
- Provides a detailed timeline of gastric surface epithelium development in human fetuses.
- Establishes a baseline for understanding normal gastric morphogenesis.
- Informs research on developmental disorders affecting the stomach.
Abstract:
The ontogenesis of the surface epithelium in the gastric mucosa was studied by means of light and electron microscopy in 41 human foetuses ranging from 7th to 12th week of gestational age. The results obtained can be summarized as follows: 1) At the 7th week the gastric mucosa shows a simple pseudostratified epithelium; the epithelial cells are undifferentiated and filled, with glycogen clusters. 2) From the 8th week the epithelial surface shows small depressions that become deeper in the mesenchyme making the first bud of the gastric foveolae. 3) At the 9-10th week the gastric foveolae are more developed. The cells of the gastric epithelium can be therefore separated in two populations: a) the cells of the foveolae; b) the cell of the mucosal surfaces. 4) At the 12th week the cells of the mucosal surface become, on the basis of their histochemical and ultrastructural characteristics, surface mucous cells. The morphological differentiation is testified mainly by the transposition of the nuclei in the basal parts of the cells and by the gradual substitution of the cytoplasmic glycogen by mucous granules.