Compact Bone
Functional unit of compact bone
What is osteon
Functional unit of spongy bone
What is
trabecula
Osteon organization in relation to function (twisting)
What is
Osteon organization in relation to function: alternating collagen fiber orientation in successive lamellae disperses torsional stress, prevent crack
True or False
Compact vs. spongy bone have same chemical composition, but different organization
What is true
Compact bone organization
What is
Solid network of bone organized in
concentric ring structures called osteons
Spongy bone organization
What is
• Irregular lattice of thin plates called trabeculae
• Osteocytes housed in lacunae
Compact bone location
What is
• External layer of all bones
• Diaphysis of long bones
Spongy bone location
What is
Epiphyses of long bones
• Surrounding marrow cavities
• Flat, short, irregular bones
Compact bone function
What is
• Gives long bones ability to withstand
forces along longitudinal axis
Spongy bone function
What is
• Withstands forces from many directions;
trabeculae are arranged along lines of stress
• Lightens the skeleton (not as strong as compact
bone)
• Contains red marrow for hemopoiesis