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Skeletal Vocab 2
9/29/08
26
Anatomy
Undergraduate 2
09/29/2008

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Term
What is a Chondroblast?
Definition
Term
What is endochondrial Ossification?
Definition
During fetal development when most of the skeleton first develops as a cartilage pattern or model, and then the cartilage of this model is gradually replaced by bone.
Term
What is a chondroblast?
Definition
A cell that produces cartilage
Term
What is a chondrocyte?
Definition
Found within the physis, which continues to proliferate and produce cartilage to provide this separation and thus allow for continued growth in the length of the long bone.
Term
What is a Chondroclast?
Definition
A multinucleated cell involved in the reabsorption of cartilage. Cartilage destroying cells.
Term
What is an osteoblast?
Definition
It is bone producing cells of the periosteum which are responsible for increases in the diameter of bones, and activity of periosteal cells is important in the healing of fractures.
Term
What is an Osteoclast?
Definition
Osteoclasts are bone destroying cells. These cells, derived from macrophages, take an active part in bone destruction by releasing organic acids and enzymes.
Term
What is an osteocyte?
Definition
Osteoblasts that have completed their bone-forming function and have become trapped in new bone tissue, evolving into structural bone cells. Mature bone cells
Term
What is the perichondrium
Definition
A fibrous layer containing more numerous chondrocytes and less matrix. The perichondrium provides the blood supply to the underlying cartilage, which does not contain blood vessels.
Term
What is the periosteum?
Definition
A fibrous membrane that covers the surface of a bone except where articular cartilage is.
Term
What is the Endosteum?
Definition
A fibrous membrane that lines the marrow cavity and osteonal canals of a bone.
*Erosion of existing bone by osteoclasts in the endosteum determines the size of marrow cavity and the thickness of the diaphyseal cortex.
Term
What is the Haversian System?
Definition
The entire structure of osteoblast makeup of bone
Term
What are Haversian canals?
Definition
The central canal containing blood vessels
Term
What are Volkmann's canals?
Definition
Where blood vessels extend form the periosteum to central canals through the volkman's canal which often travel at right angles to the central canals. When blood vessels run sideways
Term
What are Canniculi?
Definition
A system of tiny canals that connect the lucanae with in the substance of the bone. The canaliculi transmit tissue fluid that is essential for maintaining the life of the osteocytes.
Term
What is the Lucuna (e)?
Definition
Small cavities of bone where osteocytes are found
Term
What is an Osteoid?
Definition
A protanaceeous matrix that osteoblasts lay down that mineralize to form new bone.
Term
What is a primary ossification center?
Definition
The center of ossification that develops in the midshaft of a long bone
Term
What is a secondary ossification center?
Definition
Develops near the ends of long bones. It is able to grow and expand.
Term
What is the physis?
Definition
A region of cartilage that separates the primary and secondary ossification centers during growth and development. Also known as the growth plate
Term
What is the Epiphysis?
Definition
Each end of a long bone that contains a secondary ossification center
Term
What is the Diaphysis?
Definition
The midshaft region of a long bone that contains the primary ossification center
Term
What is the metaphysis?
Definition
The region on a long bone where the diaphysis and an epiphysis meet.
Term
What is articular cartilage?
Definition
A layer of hayline cartilage covering the articular surface
Term
What is a synovial membrane?
Definition
The deeper layer of the joint capsule which as a delicate layer of connective tissue extending from the edges of the articular cartilage's of the adjacent bones but not covering the articular cartilage. This membrane secrets synovial fluid, may have plicae synovials and villi synovials.
Term
What is lamellar bone?
Definition
Gives bone great strength. Made up of many columns together.
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