ClipArt ETC
Cross section of developing bone of human fetus of four months. Labels: a, periostem; b, boundary between endochondral and periosteal bone; c, perichondral bone; d, remains of area of calcification; e, endochondral bone; f, f', blood vessels; g, g', developing Haversian spaces; h, marrow; i, blood vessels.

Developing Bone

Cross section of developing bone of human fetus of four months. Labels: a, periostem; b, boundary between…

Osteoblasts from the parietal bone of a human embryo, thirteen weeks old. Labels: a, bony septa with cells of the lacunae; b, layers of osteoblasts; c, the latter in transition to bone corpuscles.

Osteoblasts

Osteoblasts from the parietal bone of a human embryo, thirteen weeks old. Labels: a, bony septa with…

Osteoblasts from the parietal bone of a human embryo thirteen weeks old. Labels: a, bony septa with the cells of he lacunae; b, layers of osteoblasts; c, the latter in transition to bone corpuscles.

Osteoblasts from Embryo

Osteoblasts from the parietal bone of a human embryo thirteen weeks old. Labels: a, bony septa with…