5. Blood Formation Flashcards
All embryonic connective tissue begins as?
Mesenchyme
Bone formation is termed as?
Osteogenesis or ossification
When does ossification begin
when mesenchymal cells provide the template for subsequent ossification.
What are the two types of ossification
Intramembranous ossification, Endochondrial ossification
What is the Intramembranous ossification
Process of bone formation fetal tissue (mesenchymal tissue) is directly converted into bone tissue
Which bones does intramembranous ossifiction make
- Flat bones of the skull
- mandible
- clavicle
- pelvis
(Development into adulthood)
What is the Endochondrial ossification
formation of bone from hyaline cartilage models
Example: long bones
Endochondrial ossification involves replacement of …….
Cartilage by bone
————-first step in endochondrial ossification is the development of …..
Hyaline Cartilage model
in the second month of development
———-Second step of endochondrial ossification
Compact Bone collar
develops around the hyaline cartilage
What are condrocytes
The only cells found in cartilage.
Are in the lacunae.
Perichondrium surrounds it.
What is the periosteal bud
Blood vessel that invades the internal cavities, spongy bone begin to form in the third stage of endochondrial ossifiction
————-Third stage of endochondrial ossifiction?
Primary ossification center occurs.
Blood vessels bring osteoblasts
————-Forth stage of endochondrial ossifiction
(Shortly after birth)
Medullary cavity forms secondary ossifiction centers which are in the epiphysis
————-Fifth stage of endochondrial ossifiction
Epiphyseal plate growth
