Lecture 3 Flashcards
(17 cards)
What is the epiphys?
It is the end of the bone containing the articular cartilege, the center of ossification and the epiphyseal disk.
What is the Diaphysis?
The sahft/ tubular portion extending from the metaphysis of one end to the metaphysis of the other.
What is Cancellous bone?
Cancellous bone forms a porous meshwork consisting of branching spicules of bone
What are the two types of bone?
woven and lamellar
What are characteristics of woven bone?
Women bone is young bone synthesized early in development. it has course fiber bundles of collagen and an increased proportion of osteocytes. It is not organized around a blood vessel- nourished by blood vessels of adjacent tissues.
What are characteristics of lamellar bone?
lamellar bone is highly organized with the collagen fibers being in paralell sheets.
Whaddup with harversian bone?
This is the highest order of bone with lamellar bone organized around blood vessels.
What are Harversian systems / osteons?
These are lamellae arranged concentrically around longitudinally oriented vascular channels called haversian canals.
What are haversian canals?
These are vascular plexi at the center of each osteon that nourishes the bone.
What is a volkmann canal?
these travel transversally to connect the haversian canals and allow the marrow cavities and perioosteum to communicate with each other.
Define Circumferential lamellae
the outer circumferance/periosteal lamellae that lies beneath the periosteum
What is the inner circumferential llamallea?
it lies beneath the endosteum
What is intramembraneous ossification?
This is when bone forms directly from mesenchymal cells
What is endocondrial offisication?
Embryonic mesenchymal cells first differentiate into hyaline cartilage forming a “cartilage model.” These are then replaced by bone tissue. e
Where can we find intramembraneous ossification occuring in a fetus?
The skull and jaw bone
What sort of growth does bone undergo to enlarge its width/circumference?
Intramembraneous
What is the epiphyseal plate?
The region of continous endochondral bone growth throughout childhood. It is cartelageous! Chondrocytes are arranged in columns. Cells under go hypertrophy, which causes growth in the appropriate direction.
