Bone - Connective Tissue 3 Flashcards
Composition of bone?
50% inorganic material
25% water
25% organic material
Types of bone
- cancellous bone
- compact bone
Cancellous bone
- naked eye - honeycomb “spongy” appearance
- microscopically - larger Haversian canals and fewer lamellae
- contains red bone marrow
Compact bone
- naked eye - appears solid
- microscopically - built up of large number of Haversian systems
- covered by periosteum
(Attachment for muscles and tendons/give protection to bone)
Microscopic picture of compact bone
Series of Haversian systems:
- central canal
- lamellae
- lacunae
- canaliculi
- osteocytes
Central canal
Contains:
- blood vessels
- lymph vessels
- nerves
Lamellae
series of cylindrical plates of bone arranged around each central canal lacunae
Lacunae
Between lamellae and contain osteocytes
Canaliculi
communicate with Lacunae- tiny channels allowing
circulation of interstitial fluid through the bone
Osteocytes
mature bone cells, monitor and maintain bone tissue and are nourished by fluid in canaliculi.
Cancellous bone
- forms spongy inner layer
- consists of bony plates or trabeculae
- make up a loose network
- surrounding spaces containing bone marrow
- marrow is responsible for formation of blood cells
What are the bone cells
Osteoblasts
Osteoclasts
Osteocytes
Responsible for bone formation
Osteoblasts
Their function is resorption of bone
Osteoclasts
Osteocytes
as bone develops, osteoblasts
become trapped and remain isolated in
lacunae, they stop forming bone at this point
and are nourished by tissue fluid in the
canaliculi that radiate from the haversian
systems
What is the cartilage producing cell
Chondrocytes
What are the types of cartilage
- hyaline
- fibrocartilage
- elastic cartilage
- articulated
- epiphyseal
Hyaline
- smooth and white-bluish
- chondrocytes small groups
- matrix solid and smooth
- gives flexibility, smooth movement at joints
(Larynx, trachea and bronchi)
Fibrocartilage
- white collagen fibres
- matrix similar to hyaline (solid and smooth)
- tougher
(Ligaments, disc of TMJ)
Elastic cartilage
- yellow elastic fibres
- support and maintains shape
(Pinna of ear, epiglottis)
Articular
- hyaline cartilage on articular surface of bones
(Joints)
Epiphyseal
- hyaline cartilage plate on end of long bone
- found in children and adolescents
(Pre bone)