one of many contractile filaments that make up a striated muscle fiber
例句
用作名词(n.)
All cells have secretory and absorptive functions besides 4ibblasts and granular cells in connective tissue, there are myofibril, collagenous fibril and unmyelinated fibers.结缔组织中除有成纤维细胞和颗粒细胞外还充满胶原原纤维和肌原纤维，无髓神经原纤维也较多。
