insect in flight, cross section diagram showing horizontal and vertical muscles. - 動物肌肉 幅插畫檔、美工圖案、卡通及圖標
human skeleton and muscles, hand-coloured engraving, published in 1861 - 動物肌肉 幅插畫檔、美工圖案、卡通及圖標人體, 人類骨架, 人體構造