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The crural interosseous membrane re-visited: a histological and microscopic study
Joseph Morley1, Chenglei Fan2, Kena McDermott1
1University of Bridgeport School of Chiropractic, Bridgeport, CT, USA.
Insights
The crural interosseous membrane has a layered collagen structure and contains sensory nerve endings, primarily free nerve endings and Ruffini corpuscles. These findings suggest the membrane plays a role in proprioception.
Area of Science:
- Anatomy
- Histology
- Neuroscience
Background:
- The crural interosseous membrane (IM) is a fibrous sheet connecting the tibia and fibula.
- Its precise microscopic structure and innervation are not fully understood.
Purpose of the Study:
- To characterize the microscopic structure of the crural interosseous membrane.
- To identify and map the distribution of sensory nerve endings within the crural IM.
Main Methods:
- Analysis of 13 human cadaveric crural interosseous membranes.
- Microscopic examination of collagen fiber organization, elastic fiber content, and IM thickness.
- Immunohistochemical staining to identify and quantify nerve elements and mechanoreceptors.
Main Results:
- The IM exhibits a two-layer collagen fascicle structure with distinct fiber orientations.
- Elastic fiber content is significantly higher between layers (10.1%) than within fascicles (2.2%).
- IM thickness increases distally, and sensory nerve endings, including free nerve endings and Ruffini corpuscles, are abundant on its surface.
Conclusions:
- The crural interosseous membrane possesses a complex microarchitecture with significant elastic fiber content.
- The presence and distribution of mechanoreceptors suggest a crucial role in proprioception and limb position sensing.
Abstract:
The aim of this study was to characterize the microscopic structure and sensory nerve endings of the crural interosseous membrane (IM). 13 IMs from 7 cadavers were used to analyze the organization of the collagen fibers, IM's thickness, distribution of elastic fibers and nerve elements. The IM is mainly a two-layer collagen fascicle structure with the collagen fibers of adjacent layers orientated along different directions, forming angles of 30.5 +/- 1.7° at proximal and 26.6 +/- 2.1° at distal part (P>0.05). The percentage of elastic fibers between the two layers and inside the collagen fascicle layer is 10.1 +/- 0.5% and 2.2 +/- 0.1% (P<0.001). The IM's thickness at proximal, middle, and distal parts is 268.5 +/- 18.6μm; 293.2 +/- 12.5μm; 365.3 +/- 19.3 μm, respectively (Proximal vs Distal: P<0.001; Middle vs Distal: P<0.05). Nerve elements were present and located both inside and on the surface of the IM, whereas the mechanoreceptors are mainly located on the surface of the IM. Free nerve endings (33.3 +/- 5.0/cm2) and Ruffini corpuscles (3.4 +/- 0.6/cm2) were the predominant sensory elements, while Pacinian corpuscles (1.3 +/- 0.7/cm2) were rarely found. The type of mechanoreceptors found suggests that the IM may play a role in proprioception.
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