SKELETEL SYSTEM BONE TISSUE
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OSTEON
-also known as Haversian System -structural unit of compact bone -elongated cylinder
LAMELLA
-matrix tube -reason why compact bone is called LAMELLAR BONE -collagen fibres and bone salts -part of COMPACT BONE
HAVERSIAN CANAL
-also known as centeral canal runs through osteon -have small blood vessels and nerve fibres -part of COMPACT BONE
PERFORATING CANALS
-also known as VOLKMANN’S CANALS -connect blood and nerve supply from medullary cavity to centeral canals -NOT surrounded by concentric lamellae, but LINED WITH ENDOSTEUM -part of COMPACT BONE
LACUNAE
-osteocytes found here -CANALICULI (canals) connect each lacunae -part of COMPACT BONE
INTERSTITIAL LAMELLAE
-incomplete lamellae -part of COMPACT BONE
CIRCUMFERENTIAL LAMELLAE
-extend around circumference of diaphysis -resist twisting of long bone -part of COMPACT BONE
WHEN DOES OSSIFICATION OCCUR?
• initial formation of bones • growth of bone during development • remodelling of bone • bone repair
FACTORS AFFECTING BONE GROWTH
• minerals • vitamins • hormones
MESENCHYMAL
-stem cells found in bone marrow for connective and skeletal tissue developement
OSTEOID
-organic portion of bone matrix that forms
HEMATOPOIETIC TISSUE
-tissue where new blood cells are formed