side chest meaning in English

侧展胸大肌（男子规定动作之三，女子规定动作之二）
侧展胸大肌造型

This specimen of a pigeon , being dissected along the middle line of its belly , whose chest and abdoment walls , chest bone , right leg , right side chest muscle and its artery and vein , as well as the portion of liver being removed , the left side chest muscle being turned outward with all intestines being pulled outside , was fixed on the board
本标本沿鸽腹部中线剖开，切除胸腹壁、胸骨、右后肢等，及部分肝以及右侧的胸动、静脉和胸肌；左侧胸肌翻向外侧，大小肠从体腔内拉出体外，标本背向衬板固定。