medical illustration of human cartilage connective tissue in the stages of endochondral ossification (bone growth) - 19th century - 骨化 幅插畫檔、美工圖案、卡通及圖標
skull, at birth, showing the fontanelles. at birth, a human skull has six fontanelles.. - 骨化 幅插畫檔、美工圖案、卡通及圖標