Pectoralis major, which is the breast muscle, and also the femoralis, which is the big muscle on your thigh.

胸大肌，也就是胸肌，还有股骨肌，也就是大腿上的大块肌肉。

These ligaments attach to the inner surface of the breast skin on one end and the pectoralis muscles on the other.

它们的一端连接在乳房皮肤内表面，另一端固定在胸大肌上。

They are formed from tenderloin, the pectoralis minor muscle, found beneath the breast but smaller and thinner.

它们由里脊形成，胸小肌位于乳房下方，但更小更薄。

When she pushes herself up, her pectoralis major is contracting, pulling its insertion point — which in this case is the top of her humerus — toward the immobile origin, which is her sternum.

当她向上推时，她的胸大肌在收缩，将其插入点——在这种情况下是肱骨顶部——拉向不动的起源，也就是胸骨。