Bone Flashcards
What are the role of osteoblasts?
They produce organic bone matrix to form bone (ie. following an injury)
What type of cell forms Howslip’s lacunae?
Osteoclast
Name the major organic component of bone
Collagen type I
What fibre penetrates the alveolar cortical plate to anchor the tooth?
Sharpey’s fibres
Name the two tissue layers of bone
Periosteum & endosteum
What is the role of the endosteum?
It lines the trabeculae & Haversian canals / internal cavities
What is the periosteum?
It is an outer sheath of fibrous CT that contains osteoprogenitor cells within
What is the periosteum?
It is an outer sheath of fibrous CT that contains osteoprogenitor cells within
What is structure is not found in compact/cortical bone?
Trabeculae
Name the two types of bone
Compact/cortical & spongy/trabecular
Where are canaliculi found?
In compact/cortical bone
What are canaliculi in the bone?
Small canals/ducts that enable cellular communication
Maturation of osteoblasts result in…
Osteocytes
What is the name of each concentric layer formed in an osteon?
Lamellae
What does appositional growth do to long bones?
It increases the diameter of bone
What is interstitial growth?
The growth of chondrocytes in lacunae of epiphyseal plates and increases the length of bone
What are osteoprogenitor cells?
Stem cells that differentiate into osteoblasts
Name the two types of ossification
Intramembranous & endochondral
Where does intramembranous ossification occur?
Within mesenchymal tissue
Where does endochondral ossification occur?
In cartilage
What does intramembranous ossification lead to?
Formation of long bones & bones of skull base (ie. ethmoid & sphenoid)
What does endochondral ossification lead to?
Formation of flat bones
What is hypertrophy?
Chondrocytes increase in size
Flat bones of the body include…
Most cranial bones, bones of the face & clavicles (collarbones)
