skull, at birth, showing the fontanelles. at birth, a human skull has six fontanelles.. - 鈣化 幅插畫檔、美工圖案、卡通及圖標
medical illustration of human cartilage connective tissue in the stages of endochondral ossification (bone growth) - 19th century - 鈣化 幅插畫檔、美工圖案、卡通及圖標骨化
microscopic view of dentine. dentine is the main supporting structure of the tooth and is the second hardest tissue in the body after enamel. it is 70% mineral and acellular. - 鈣化 幅插畫檔、美工圖案、卡通及圖標