Internals Bone Structure

Red Bone Marrow

Inside the spongy bone (little open circles is where it is ); only where there is space

Articular (Hyaline) Cartilage

On the outside top and bottom parts of a bone so on each end of the bone

Cancellous (Spongy) Bone

Open little circles; inside the ends of the bones

Epiphyseal line (or disk)/ growth plate

thick or thin line inside the proximal (top) and distal (end) epiphysis

Compact Bone

frames the space; in the diaphysis part of the bone; between the epiphyseal line and diaphysis; very thick around shaft

Endosteum

lining (membrane)-loaded w/osteoblasts; inside diaphysis

Sharpey’s fibers

short collagen fibers, anchors blood vessels, “staples” holding the membrane to bone

Medullary Cavity

space; it is lined by the endosteum

Yellow Bone Marrow

holds adipose (fat) tissue; cylinder-looking; below medullary cavity

periosteum

lining (membrane) loaded w/osteoblasts to heal any damage; on the shaft (diaphysis)

Nutrient Artiery

Vein

Nutrient Foramen

a hole; found at middle top end and bottom end of bone

Osteoblasts

build bone; young bone cells

Osteocytes

old bone cells; maintain bone cells

Osteoclasts

break down bone

Proximal Epiphysis

top end part of bone (closest to the head)

Diaphysis

middle part of bone; between the proximal and distal epiphysis

Distal Epiphysis

bottom end part of bone (farther from head)