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Morphological study on vagal innervation in human atrioventricular valves using histochemical method
1Research Laboratory for Cardiovascular Pathology, Juntendo University School of Medicine, Tokyo, Japan.
Japanese Circulation Journal
|August 1, 1993
Summary
Human atrioventricular valves, including the tricuspid and mitral valves, possess a network of acetylcholinesterase-positive nerve fibers. This innervation, particularly in the valve base and chordae tendineae, suggests a role in moderating contraction and sensing stress.
Area of Science:
- Cardiovascular Anatomy
- Neuroanatomy
- Histology
Background:
- The innervation of human atrioventricular valves is not well-established.
- Understanding valve innervation may elucidate mechanisms of valve function and disease.
Purpose of the Study:
- To investigate and demonstrate the presence and distribution of nerve fibers within human atrioventricular valves.
Main Methods:
- Histochemical staining for acetylcholinesterase was performed on human tricuspid and mitral valve tissue.
- Microscopic examination was used to identify and map nerve fiber distribution.
Main Results:
- Acetylcholinesterase-positive nerve fibers were observed throughout the atrioventricular valves, from base to edge.
- Nerve fibers formed a plexus, denser at the base and commissures, innervating leaflets and approximately half of the chordae tendineae.
- Thicker nerve fibers featured varicose apparatuses, while thinner fibers ended in dot or brush-like formations.
Conclusions:
- Human atrioventricular valves are innervated, suggesting a role for the nervous system in regulating valve movement and structure.
- Vagal innervation may moderate myocyte contraction at the valve base and sense mechanical stress within the valves.