Mesenchymal cells
Osteoprogenitor cells
It doesn't have one location. Osteoprogenitor cells are mesenchymal stem cells, that are present in the bone marrow, perioustem and even adipose tissue.
Ossification is the process of laying down new bone material by cells called Osteoblasts.
1. a bone collar is laid down around the diaphysis of the hyaline cartilage model. 2. cartilage in the center of the diaphysis calcifies and then develops cavities. 3. the periosteal bud invades the internal cavities and spongy bone forms. 4. the diaphysis elongates and a medullary cavity forms. 5. the epiphyses ossify.
Appositional growth
Osteoprogenitor cells are undifferentiated cells found in the perichondrium. These later become osteoblasts - which secrete osteoid (part of the bone matrix). Chondrocytes are responsible for calcification.
Osteoprogenitor cells
Osteoblast Cell, Osteoprogenitor cells , Osteoclast cells and Osteocytes cells
It doesn't have one location. Osteoprogenitor cells are mesenchymal stem cells, that are present in the bone marrow, perioustem and even adipose tissue.
Osteoprogenitor cells differentiate into osteoblasts. Osteoblasts develop osteocytes.
Ossification is the process of laying down new bone material by cells called Osteoblasts.
1. a bone collar is laid down around the diaphysis of the hyaline cartilage model. 2. cartilage in the center of the diaphysis calcifies and then develops cavities. 3. the periosteal bud invades the internal cavities and spongy bone forms. 4. the diaphysis elongates and a medullary cavity forms. 5. the epiphyses ossify.
Osteoblasts arise from osteoprogenitor cells located in the deeper layer of periosteum and the bone marrow.
I believe it's immature bone because it has the mesenchyme cells, osteoprogenitor cells and osteoblasts. While mature bone has the osteocytes.
Intramembranous ossification begins when osteoblasts differentiate within a mesenchymal or fibrous connective tissue.
Appositional growth
Ossification.