Fenestrations
Fenestrations - Related Videos
08:38
A Standardized Method for the Analysis of Liver Sinusoidal Endothelial Cells and Their Fenestrations by Scanning Electron Microscopy
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Cited by 41 •
2015
The fenestrated liver sinusoidal endothelial cell is a biologically important filter system that is highly influenced by various diseases, toxins, and physiological states. These changes significantly impact on liver function. We describe methods for the standardisation of the measurement of the size and number of fenestrations in these cells.
10:25
In Utero Intra-cardiac Tomato-lectin Injections on Mouse Embryos to Gauge Renal Blood Flow
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Cited by 2 •
2015
This manuscript describes a technique for visualization of the developing vasculature. Here we utilized in utero intra-cardiac FITC-labeled tomato lectin microinjections on mouse embryos. Using this technique, we delineate the perfused and unperfused vessels throughout the embryonic kidney.
10:56
Tube Thoracostomy
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2023
Source: Rachel Liu, BAO, MBBCh, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA Tube thoracostomy (chest tube placement) is a procedure during which a hollow tube is inserted into the thoracic cavity for drainage of fluid or air. Emergency chest tube insertion is performed for definitive treatment of tension pneumothorax, traumatic hemothorax, large-volume pleural effusions, and empyemas. Irrespective of the cause of air and fluid accumulation in the pleural space, the...
08:55
In vivo Measurement of the Mouse Pulmonary Endothelial Surface Layer
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Cited by 17 •
2013
The endothelial glycocalyx/endothelial surface layer is ideally studied using intravital microscopy. Intravital microscopy is technically challenging in a moving organ such as the lung. We demonstrate how simultaneous brightfield and fluorescent microscopy may be used to estimate endothelial surface layer thickness in a freely-moving in vivo mouse lung.
06:53
A Rat Tibial Growth Plate Injury Model to Characterize Repair Mechanisms and Evaluate Growth Plate Regeneration Strategies
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Cited by 22 •
2017
The growth plate is a cartilaginous region in children's long bones where longitudinal growth occurs. When injured, bony tissue can form and impair growth. We describe a rat model of growth plate injury that leads to bony repair tissue, allowing the study of repair mechanisms and growth plate regeneration strategies.
FAQs
Fenestrations increase exchange efficiency by opening a transcellular route through the endothelial cell itself. This route is shorter than movement across an uninterrupted cellular barrier, so water, ions, and selected small solutes can cross more readily. Larger molecules remain more restricted, preserving a degree of barrier selectivity while supporting rapid microvascular exchange.
Thin diaphragms over some fenestrations add a further control point within the opening. They do not eliminate the exchange pathway; instead, they contribute to the restriction that determines which substances pass readily. This additional structural feature helps explain why fenestrated endothelium can support efficient transfer without becoming equally permeable to all molecules.
Selective permeability allows a tissue to receive or release needed small substances while limiting passage of larger molecules. In fenestrated capillaries, that balance links pore structure to organ function: efficient movement can support filtration, absorption, or secretion, yet the endothelial barrier still imposes size-based restriction. The result depends on both openings and their diaphragms.
They are especially relevant in the kidneys, intestinal villi, and endocrine glands, where microvascular exchange must support filtration, absorption, or secretion. Their presence provides a structural explanation for why these tissues can perform high-throughput exchange with surrounding tissue. Comparing their distribution among organs helps connect local vascular architecture with the physiological role of each site.
Mapping where fenestrations occur helps investigators relate endothelial architecture to the exchange demands of different tissues. Structural distribution can indicate how readily a vascular region is organized for filtration, absorption, or secretion, while differences between sites may clarify why organs handle blood-tissue exchange differently. This makes fenestrations a useful anatomical and functional marker.
Changes in the structure or distribution of fenestrations can be examined as potential indicators of altered microvascular function. Because these openings influence passage between blood and surrounding tissue, disease-associated changes may help explain abnormal exchange. Studying such patterns connects microscopic endothelial alterations with broader effects on filtration, absorption, or secretion in affected organs.