Topic 9: Skeletal System - Bone Ossification Flashcards
1
Q
What is the function of the skeletal system? (5)
A
- support
- protection of vital organs
- attaches muscles and allows movement
- red marrow produces ALL blood cells
- stores Ca++
2
Q
What are the two types of bone ossification?
A
- intramembranous ossification
- Endochondrial ossification (most bones)
3
Q
What does the skeleton of an embryo consist of before week 8?
A
- fibrous membranes and hyaline cartilage
4
Q
When does bone formation occur?
A
- around 8th week to 20 years old
5
Q
Which bones undergo intramembranous ossification? (2)
A
- flat bones
- some skull bones, mandible, clavicle
6
Q
Intramembranous ossification develop from ______
A
fibrous CT membrane
7
Q
What is the process of intramembranous ossification? (2)
A
- osteoblasts produce spongy bone along CT fibres
- periosteum forms and then osteoblasts under it lay down compact bone
8
Q
What are fontanels? (part of intramembranous ossification
A
unossified membranes in the skull that remain at births
9
Q
What occurs in endochondrial ossification? (3)
A
- hyaline cartilage used as a model (similar shape) for bone construction
- then ossifies to form spongy bone
- periosteum forms and the osteoblasts beneath lay down compact bone
in lecture, its like a road map and you are adding minerals to make it stronger
10
Q
In endochondral ossification, what is articular cartilage and epiphyseal plates?
A
cartilage that has not been ossified (reduce friction so less damage to bone)
