Anat & Phys Farm Animals

osteoprogenitor

stem cells

location: perio/endosteum

osteoblasts

synthesize bone tissue

location: perio/endosteum

active = forming bone; inactive = bone lining cells

osteoclasts

degrade bone (release H+, enzymes, ca2)

location: external/internal bone surfaces

osteocytes

osteoblasts trapped in matric

structure!

most abundant

Inorganic matrix

strength

hydroxyapatite (CaP + CaOH)

Organic Matrix

flexibility

osteoid (secreted by osteoblasts - collagen fibers + other proteins)

Types of tissue in bone

nervous

muscle

epithelial (smooth)

connective (cartilage, adipose, osseous)

Compact bone

Made of osteons

most common in short, flat, irregular bones

strong

Spongy Bone

Trabecular bone matrix surrounded by bone marrow

light + empty space 

flexible 

most common in long bone 

Osteon

Part of compact bone composed of lammellae, haversian canal, volkman canal

Lammellae

mineralized osetoid in circles around haversian canals

contains lacunaue where osteocytes are located

Haversian Canal

vertical/parallel vein and artery in osteon 

Volkman Canal

horizontal/vertical canals that supply osteon with blood from heart/take it away

Lacunae

spots where osteocytes are embeded