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Structure of sinuses in the human lymph node
Cell and Tissue Research
|September 14, 1977
Summary
This study used a novel casting technique to visualize human lymph node microcirculation. Findings reveal gaps in sinus walls, facilitating cell movement between the sinus lumen and lymphoid parenchyma.
Area of Science:
- Immunology
- Anatomy
- Microcirculation
Background:
- The human lymph node's intricate microcirculation is crucial for immune responses.
- Understanding lymphatic sinus structure is key to comprehending immune cell trafficking.
Purpose of the Study:
- To visualize the three-dimensional lymphatic microcirculation within the human lymph node using a novel casting technique.
- To investigate the structural integrity of lymphatic sinuses and their role in cell transit.
Main Methods:
- A specialized casting compound was used to fill and visualize the lymphatic microcirculation.
- Three-dimensional casts of the lymph node's internal structures were created.
- Electron microscopy was employed to examine the endothelial lining of the lymphatic sinuses.
Main Results:
- Casting revealed well-defined channels within the lymph node, converging into efferent lymphatics.
- The outer sinus walls and trabecular sinus sides exhibited intact endothelium.
- Gaps were observed in the inner marginal sinus wall and parenchymal wall of trabecular sinuses, particularly in the medulla.
Conclusions:
- Lymphatic sinus walls adjacent to connective tissue act as barriers, while those near lymphoid cells have gaps.
- These structural features facilitate cell movement between the sinus lumen and the lymphoid parenchyma.
- The findings provide new insights into immune cell trafficking within human lymph nodes.