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Immunohistochemical characterization of human masseter muscle spindles

, : Immunohistochemical characterization of human masseter muscle spindles. Muscle & Nerve 17(1): 31-41

An enzyme- and immunohistochemical study has been performed on human masseter muscle spindles. Antibodies selective for different myosin heavy chain (MHC) isoforms and M-band proteins (M-protein, myomesin, and MM-CK) were used. The expression of these proteins was determined in the different intrafusal fiber types. Nuclear bag-1 and nuclear bag, fibers expressed predominantly slow-twitch and slowtonic MHCs. The bag-2 fibers in addition contained fetal MHC. Nuclear chain fibers coexpressed embryonic, fetal, and fast-twitch MHCs. The bag-2 and chain fibers contained all three M-band proteins, whereas the bag, fibers contained only myomesin. In general the MHC expression in the human masseter intrafusal fiber types was similar to that previously reported for limb muscles in man as well as for limb and masseter muscles in other species. However, the number of intrafusal fibers per spindle was unusually high (up to 36). This reinforces the idea that masseter muscle spindles have a strong proprioceptive impact during the control of jaw movements.


PMID: 8264700

DOI: 10.1002/mus.880170105

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