Bone cells/histology

Osteoprogenitor cells

Can differentiate into osteoblasts when needed

Osteoblasts

Cells associated with bone formation

Osteocytes

Cells that maintain daily cellular activity of bone tissues

Osteoclasts

Cells involved in bone removal

osteons/haversian systems

Structural and functional units of compact bone

Compact bone

Based on osteon units

Spongy (cancellous) bone

Lacks osteon units, consists of lattice work of trabeculae

Trabeculae

Layers of rod-like lattice work found at the end of long bones, where joints transfer force, constantly being broken down and rebuilt

Hemopoiesis

Production of blood, red bone marrow.

Intramembranous growth

Bones of skull, mandible, and clavicle, forms in mesenchymal cells. these develop into a sandwichof bone between two layers of connective tissue.

Endochondral growth

Bone growth via internal expansion of cartilage models into bone, primarily in long bones.

Primary ossification

Osteoblasts will secrete bone matrix to replace cartilage

Secondary ossification

Growth associated within the epiphyses of long bones, bone grows via surface addition

Continual ossification

Epiphyseal plate will be reduced to epiphyseal line

Fontanel

The soft spot on a baby’s head