Aponeurosis

Japanese: aponeurosis

...As mentioned earlier, the ciliary muscle in the ciliary body of the eye is a smooth muscle, but it can actually move voluntarily when adjusting the focus of the eye.
[Structure and shape of striated muscles]
A striated muscle is a bundle of muscle cells, the surface of which is covered by a thin membrane made of connective tissue fibers called the fascia aponeurosis. Fascia not only covers the surface of each muscle, but also covers the surface layers of several muscles that have the same function.

From [Tendon]

…Abundant collagen fibers are produced by these tendon cells. A tendon is surrounded by a membrane of loose connective tissue called the aponeurosis, which is a continuation of the fascia. This loose connective tissue penetrates into the tendon and divides it into several rough bundles. …

*Some of the terminology explanations that mention "aponeurosis" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…なお，先に述べたように，眼球の毛様体にある毛様体筋は平滑筋であるが，目の遠近の調節時にはむしろ随意的に動かすことができる。
［横紋筋の構造と形］
　一つの横紋筋は多くの筋細胞が束ねられたもので，その表面は筋膜aponeurosisという結合組織繊維から成る薄い膜によって覆われている。筋膜は個々の筋肉の表面を覆うほか，同じ作用を有するいくつかの筋肉の表層をも共通に包んでいる。…