Intramembraneous Ossification Bones Intramembraneous Ossification

Mesenchymal cells condense into an ossification center

Cancellous vs Compact Bone Bones Cancellous vs Compact Bone

Diagram of a long bone withcompact and cancellous bone

Long bone with compact (arrows) and cancellous bone

Cancellous Bone

LM of a cancellous bone spicule

Diagram of compact bone (Haversian Systems)

Compact Bone

Haversian system (osteon) with central canal and osteocytes in lacunae connected by canaliculi

Decalcified compact bone

Bones The cells of bone

TEM of an osteocyte in lacuane (left) and high mag of calcifying matrix (right)

Multinucleated osteoclast

SEM of an osteoclast

Endochondrial Ossification - Long bone growth Bones Endochondrial Ossification - Long bone growth

Diagram of endochondrial ossification

Low mag of an epiphyseal growth plate (square) of a long bone

Long bone growth plate at epiphyseal end – note four zones