ヒト内喉頭筋の筋紡錘の酵素組織化学的検討

抄録

Muscle spindles were investigated using enzyme histochemistry in serial sections of human intrinsic laryngeal muscles obtained from surgical specimens. Muscle spindles were demonstrated in the middle one third of each laryngeal muscle. Five muscle spindles were observed in the interarytenoid, three in the posterior cricoarytenoid, two in the cricothyroid and thyroarytenoid, and one in the lateral cricoarytenoid. The maximum width of the muscle spindles ranged from 35 to 150 μm. Each muscle spindle contained three to eight intrafusal fibers, and the intrafusal fibers ranged from 7.7 to 15.6 μm in diameter. On the basis of enzyme reactivity, intrafusal fibers could be classified into three kinds of muscle fiber, nuclear bags fibers, nuclear bag₂ fibers and nuclear chain fibers, which is the same classification observed in other skeletal muscles.