Anatomy Objectives Flashcards
Which cells lay down bone matrix?
Osteoblasts
Osteoblasts later become what cell type of mature bone?
Osteocytes
The cells which direct deposition of cartilage and bone are derived from what?
The mesenchyme.
The mesenchyme forms the greater part of the middle germ layer known as what?
Mesoderm
What is the basic osteophyte structure
Each osteophyte rests in the lacuna and has long branching processes which extend through canaliculi in the mineralized matrix to the lacunae of neighboring cells.
Fetal skeleton is characterized by bones formed in a membrane (intramembranous ossification) which precedes or accompanies bones formed in cartilage (endochondral ossification)
Gimme!
Membrane bones develop in what tissue?
Fibrous tissue (Cranium and facial bones)
Cartilage bone is preformed in what tissue?
Cartilage
Intramembranous ossification determines which measurement of the bone?
Diameter
In intramembranous ossification, Mesenchymal cells coalesce to form what kind of model of the future bone?
Fibrous model
Endochondral ossification determines which measurement of the bone?
Length
In endochondral ossification, mesenchymal cells form what kind of model of the future bone
Cartilage model
Ossification takes place within the cartilage model by 1 or more centers of ossification. Where is the primary and secondary sites located?
Primary site - center
Secondary at the ends of bones
In the primary ossification site, cartilage cells hypertrophy and arranged themselves in rows
Gimme!
Calcification of the intercellular matrix occurs followed by death of the chondrocytes. At the same time, blood vessels with osteoblasts from the peripheral tissues invade the central area?
Gimme!
Compact bone is formed under the direct ratio of stress known as what law?
Wolff’s Law
Spongy bone of the skull is known as what?
Diploe
An investing layer of connective tissue which covers the non-articular surfaces of all bones is known as what type of bone?
Periosteum