L5 - Bone Growth And Tissues Flashcards
Endochondral ossification
Process of turning cartilage to bone
Step 1 of process
Start of calcification
Step 2
Blood vessels and osteoblasts grow outside cartilage
Step 3
Blood vessels and osteoblasts become internal
Step 4
Primary ossification centre is developed
Primary ossification centre
The first place that ossification occurs,in the diaphysis
Step 5
Secondary centres of ossification form
Secondary ossification centres
Found in the epiphyses, same ossification process, separated from the diaphysis by un-ossified cartilage called the growth plate
Epiphyseal plates purpose
To allow bone growth to occur, adding layers of bone to the growth plate and allows them to increase while the joints stay appropriately proportional
Step 6
Epiphyses start to fuse with diaphyses
Chondrocytes at Epiphyseal side
Continue to divide and enlarge
Chondrocytes at diaphyseal side
Degenerate
Cartilage
Hyaline - default, fibrocartilage - fiborous cartilage
DFCT
Dense fibrous connective tissue
DFCT examples
Ligaments, tendons, and joint capsules
Chondrocytes
Make cartilage and are found in lacuna
Ground substance
Weird shit with collagen fibers
Avascular
No blood vessels, nutrients must diffuse through matrix by joint loading
Joint loading
Pushing the substance through the cartilage with movement
Hyaline cartilage function
Resist compression
Hyaline cartilage form
High water content in matrix and sparse collagen fibers
Subcondal
Under cartilage
Fibrocartilage purpose
Resist compressions and tension
Fibrocartilage form
Many collagen fibres, water in ground substance
Fibrocartilage purpose
To act as a buffer and shock absorber and deepens articular surface
DFCT
Makes fibroblasts, collegen fibres, elastin fibers that are packed tightly together
DCFT purpose
Tension resisting
Ligaments
Connect bone to bone
Ligaments made of
Olsen and elastin
Tendons
Connect bone to muscle
Tendon made of
Collagen fibers and fibroblasts
Bony congruence
Sum of bone surfaces that from an articulation, high is stable and low is less, more tissue for support
Joint classifications
Fibrous, cartilaginous, synovial
Fibrous
Least movement
Synovial
Most movement, limbs
Cartilaginous joints
Some movement
Fibrous joints
Tissues, DFCT, structure, Ligaments
Fibrous joint purpose
To limit movement
Distal tibiofibular joint
Stability of ankle, prevents rotational movements at ankle joint
Cartilaginous joints
Tissue, fibrocartilage, structure, varies
Cartilaginous joint function
Allows some movement and are connected entirely by fibrocartilage
Pubic symphysis
Attaches the two pubic bones of the hip, allows us to sway hips and shift weight from side to side