Bone Structure/Gross Anatomy of Bone

What are four type layers?

Periosteum, Compact Bone, Spongy Bone, & Bone Marrow

Periosteum

covers bone with a dense, fibrous membrane.

What does Periosteum contain?

Blood Vessels

Compact Bone

lies beneath the periosteum

Spongy Bone

Lies beneath the compact bone

Bone Marrow

fills the gaps between the spongy bone (Red) or (Medullary Cavity- Yellow)

What type of layer is Compact Bone?

Dense Outer Layer

What does the compact bone utilize?

Haversian Systems

Haversian Systems is also known as

Osteons (Bullseye)

What does Haversian system look like?

Long, Cylindrical structure arranged in parallel along the long axis of the bone

How does Haversian system provide

helps the bone to withstands compression

What does Haversian Systems consists of?

Lamellae, Lacunae, Osteocytes, & Canaliculi

Lamellae

concentric, cylinder shaped layer of bone matrix

Lacunate

the small cavity containing an osteocyte in bone, or a chondrocyte in cartilage

CB:Osterocytes

facilitate exchange of calcium between blood & bone; Housed in a Lacuna

Canaliculi

canals connecting the lacunae together and to the Haversian canal which carries nutrients/wastes from vessels in the Haversian canal

Spongy (Cancellous) Bone

light, spongy; No Haversian systems; Web-like arrangement

Where is the Spongy Bone found?

low stress area where weight of bone would be a problem

Trabeculae

little “beams” of bone; fills open spaces with marrow

Where are Spongy Bone located?

Ends of Long Bones, Ribs, Sternum, Hips, Vertebrae, Cranium.