Abstract
Using 15 cricothyroid joint (CT joint) specimens obtained from donated cadavers of elderly individuals, we examined the morphologies of the ceratocricoid ligaments as well as the synovial tissue. The ligaments consistently contained abundant elastic fibers: the fibers tended to be straight on the anterior side in contrast to a mesh-like arrangement on the posterior side. Thick and/or long synovial folds were often evident in the CT joint. The synovial tissue usually contained CD68-positive macrophages, but the positive cells were often restricted to certain parts of the tissue. Factor VIII-positive capillaries were present but few in number, and CD3- or IgM-positive lymphocytes were absent in the synovial tissue. Degenerative changes in the joint cartilage, such as roughness or thinning, were often present, but no cartilage defects were evident. Therefore, in contrast to the small, non-weight-bearing joints of the musculoskeletal system, we considered the degeneration of the CT joint to be a specific, silent form of osteoarthritis. For high-pitched phonation and ossification of the laryngeal cartilage, the CT joint in elderly individuals seemed to maintain its anterior gliding and rotation with the aid of elastic fiber-rich tissues compensating for the loss of congruity between the joint cartilage surfaces.
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Acknowledgments
We are grateful to the individuals who donated their bodies after death to Tokyo Dental College for research and education on human anatomy without any economic benefit. We also thank their families for agreeing to the donation as well as their patience in waiting for the return of their remains after the study.
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Serikawa, M., Yamamoto, M., Kawamoto, A. et al. The cricothyroid joint in elderly Japanese individuals. Anat Sci Int 91, 250–257 (2016). https://doi.org/10.1007/s12565-015-0294-x
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DOI: https://doi.org/10.1007/s12565-015-0294-x