Bone Flashcards
Why is bone classified as a specialized connective tissue?
Because it is mineralized and rigid
Does bone have cells, vessels and nerve fibers
Yes
True or false: bone is made once and is not reformed unless damage occurs
False-constantly being remodeled
What happens when pressure is applied to bone?
Bone resoption
Tension on bone results in what?
Bone deposition
What are the factors that contribute to orthodontic treatment on teeth that helps to reshape the bony tooth socket?
Tension and pressure
What are the four major functions of bone?
- Support and protection
- leverage for moement
- storage for minerals
- blood cell formation
What are epiphyeses?
the two bulbous ends of long bones
What covers the articulating surfaces of epiphyses?
hyaline cartilage
What do epiphyseal (growth) plates consist of?
hyaline cartilage that ossify at 18-20 y.o.
What is the metaphysis?
The articulation between the epiphysea place and the diaphysis
What is the diaphysis?
the loing, ylindrical shaft between the two epiphyses
What is at the core of the long shaft of bones?
Marrow
What is the external CT that covers bones capsules?
Periosteum
How many layers does the periosteum have? Which layer is growing/
Two layers–outer layer is active
What is the type of bone that lines our teeth sockets?
The primary immature bundle bone
What is the inner connective tissue of bone called?
The endosteum
True or false: periosteum encircles the entire long bone
False–the epiphyses do not have periosteum
What does the outer layer of periosteum contain?
- Dense, collagenous CT and fibroblasts
- blood vessels, lymph, nerves
- Anchoring “Sharpey’s fibers”
What anchors the periosteum to the underlying bone?
Sharpey’s fibers
The cellular layer of the periosteum contains what?
Osteoprogenitor cells (immature bone cells)
Where do the osetoprogenitor cells lie?
The inner cellular layer of bone
What is osteoid?
Soft, organic, non-mineralized bone that comes from osteoprogenitor cells, and is secreted into the inner cell layer
What is the difference between growing and non-growing bone?
The inner cell layer of growing bone will have osteoprogenitor cells, while mature bones will have periosteal cells