Makes up approx. 85% of the skeleton; present in every bone; highly organized, solid, and extremely
strong--basic structural unit is Haversian system.
Spongy bone (cancellous bone)
Makes up approx. 15% of the skeleton; present in every bone;
-less complex and lacks haversian systems
-the lamellae are not arranged in concentric layers but in plates or bar termed trabeculae that branch
and unite with one another to form an irregular meshwork
-spaces b/w the trabeculae are filled with red bone marrow.
Periosteum
, All bones are covered with a double-layered connective tissue.
Sharpey Fibers
Collagenous fibers that penetrate the bone and help hold or attach tendons and ligaments to the
periosteum.
Diaphysis
Narrow tubular midportion of a long bone.
Metaphysis
Broader neck of a long bone.
Epiphysis
The broad end of a long bone.
Endosteum
Lines the outer surfaces of both types of marrow cavity.
Flat bones
(Ribs or scapulae) 2 plates of compact bone which are roughly parallel to each other; b/w the compact
bone plates is a layer of spongy bone.
Short bones
(Cuboidal bones) (wrist or ankle) often cuboidal in shape; consist of spongy bone covered by a thin layer
of compact bone.
Irregular bones
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