早在 5 0年代后期 ,国外已有学者对牡蛎等双壳类内收肌内的平滑肌细胞进行了研究 ,并发现这些平滑肌细胞内有一种非常粗的肌丝 (即粗肌丝 )。其横径粗细不一 ,因而可将平滑肌细胞分为几种类型。此后还发现这种粗丝以副肌球蛋白为轴心 ,外围以肌动蛋白[1— 4 ] 。著者在检查虾夷 As early as the late 1950s, some foreign scholars have studied the smooth muscle cells of bovine adductor muscle such as oysters and found that there is a very thick myofilament (ie, thick myofilament) in these smooth muscle cells. The width of their different diameter, which can be divided into several types of smooth muscle cells. Since then, it has also been found that this thick filament takes paramyosin as its axis and peripheral actin [1-4]. The author is checking the shrimp