This forms what's called the rectus sheath.

这就形成了所谓的肌鞘。

The incision begins along the left subcostal margin, across the right rectus and extending well into the flank.

切口沿着左侧肋间隙开始穿过右侧腹肌，延伸到胁腹部。

Possible depressed orbital fracture with inferior rectus entrapment.

可能有凹陷骨折伴下肌挤压伤。

Both groups observed improvements in three additional quad muscle sites, specifically the rectus femoris, but the REPS group improved slightly more.

两组都观察到另外三个四肌部位的肌肉改善，特别是股肌，但是次数组改善得稍微多一点。

In a big power-generating muscle like your rectus femoris in your quad, each of a thousand or so motor neurons may synapse with, and innervate, a thousand muscle fibers.

在一块能发电的肌肉里，就像你四肢的股肌，一千个左右的运动神经元中的每一个都可能与一千条肌肉纤维形成突触，并支配它们。