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Ultrastructure of myoid cells in the chick thymus
1Department of Anatomy, Faculty of Medicine, National University of Singapore, Kent Ridge.
Insights
Ultrastructural analysis of chick thymus myoid cells reveals their role in structural support and potential contractility within the medulla. These findings offer insights into thymic microenvironment dynamics.
Area of Science:
- Immunology
- Cell Biology
- Developmental Biology
Background:
- Myoid cells are specialized cells found in the thymus.
- Their precise function and ultrastructure within the thymic microenvironment are not fully elucidated.
Purpose of the Study:
- To investigate the ultrastructure of myoid cells in the thymus of 2-week-old chicks.
- To understand the cellular associations and potential functional roles of these cells.
Main Methods:
- Electron microscopy was used to examine the ultrastructure of myoid cells.
- Localization and association of myoid cells with other thymic structures were analyzed.
Main Results:
- Myoid cells are round or elongated, found in the medulla and corticomedullary junction.
- They are interspersed with reticular epithelial cells, forming part of the thymic meshwork.
- Myoid cells contain myofibrils, smooth endoplasmic reticulum, mitochondria, and ribosomes, suggesting contractile and metabolic activity.
- Associations with intercellular cysts and blood vessels were observed.
Conclusions:
- Myoid cells contribute significantly to the structural framework of the thymic medulla.
- Their contractile properties may influence cystic and vascular flow within the thymus.
- These findings enhance our understanding of thymic microenvironment development and function.
Abstract:
1. The ultrastructure of the myoid cells in the thymus of 2-week old chicks was examined by electron microscopy. 2. Myoid cells are round or elongated, distributed singly or in clusters in the medulla and at the corticomedullary junction. They are interposed between reticular epithelial cells to provide support for the meshwork of the microenvironment. They are also inserted into intercellular cysts, or associated with blood vessels and endocrine-like cells. 3. The cytoplasm of the myoid cell is packed with myofibrils arranged in circular bundles around the nucleus, aligned in register to form sarcomeres or randomly distributed. The interfibrillar cytoplasm contains smooth endoplasmic reticulum, mitochondria and free ribosomes. 4. The myoid cells contribute to the formation of the structural framework of the medulla. Their association with intercellular cysts and blood vessels suggests that their contractility may affect cystic and vascular flow.
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