intrafusal muscle fiber

例句：

1. 1.The intramuscular exercise helps to strengthen the muscles.
   内肌锻炼有助于增强肌肉。
2. 2. The intramuscular tissue is responsible for providing support and structure to the body.
   内肌组织负责为身体提供支持和结构。
3. 3. The intramuscular fat is often associated with a higher risk of heart disease.
   内肌脂肪往往与更高的心脏病风险相关。