Morphology and innervation of the human cremaster muscle in relation to its function.

摘要: The electromyographic properties of the cremaster muscle (CM) are quite different from other skeletal muscles. It shows excessive spontaneous discharges, and motor unit shape firing frequency CM differ that limb In this study, six adult cadavers orchiectomy specimens were used to reveal detailed histology provide an anatomophysiological explanation for these unusual properties. Routine histochemical stains revealed was composed several distinct bundles smooth striated fibers within connective tissue. more profuse than previously known not arranged in layers, but widely dispersed between fibers. Bielschowsky silver staining technique, anti-neurofilament anti-synaptophysin immunostaining showed presence multiple end-plates observed as a series small dots or lines running along nerve endings on single fiber. Myosin confirmed is slow-twitch muscle, α-actin large number There also multipolar neurons forming plexuses Anti-GFAP glial cells similar astrocytes. conclusion, findings anatomical study CM, contains fibers, discharges due dense innervation. Anat Rec,291:790-796, 2008. © 2008 Wiley-Liss, Inc.