noun
myofibril
Anatomical term for the contractile thread-like structures within muscle cells.
筋原線維は筋肉の収縮に重要な役割を果たす。
Myofibrils play an important role in muscle contraction.
Compound of 筋 (muscle), 原 (origin), and 線維 (fiber), reflecting its meaning as the fundamental contractile fiber of muscle.