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Skeletal system
n/a
10
Anatomy
Undergraduate 2
03/05/2009

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Term
Hematopoiesis
Definition
blood cell production- the red marrow produces both red and white blood cells
Term
Osteoprogenitor cells
Definition
these cells are derived from mesenchyme, differentiate into osteoblasts. These cells are the "stem cells" for bone; they have the ability to differentiate into adipose cells, chondroblasts, and fibroblasts and can modify their physical and physiological characteristics in response to specific stimuli.
Term
Osseous tissue
Definition
this tissue has a matrix containing inorganic salts and organic fibers. The inorganic matrix gives the rigidity and hardness to bone and is composed of a combination of calcium and phosphorus salts. The organic collagen fibers give this tissue its tensile strength and resistance to strength.
Term
Osteoblasts
Definition
bone forming cells which actively produce bone tissue; are responsible for calcification of the matrix.
Term
Osteocytes
Definition
mature bone cells which are responsible for maintaining the bone matrix. They can synthesize and resorb the matrix to maintain homeostasis.
Term
Lacuna
Definition
each osteocyte occupies one of these spaces; this space conforms to the shape of the cells surrounded by matrix secreted when the cells was an osteoblast.
Term
Canaliculi
Definition
osteocytes extend processed through these which connect to neighboring cells by means of a gap junction.
Term
Cortical bone
Definition
"compact" bone- made of dense regular arrangements of osteons. This type of bone is found in the diaphysis of long bones and as the outer layer of all bones.
Term
Cancellous bone
Definition
"spongy" bone- a network of thin, connecting spicules which form a meshwork in the interior of bones. This type of bone has an irregular pattern containing spaces within the bone.
Term
osteoclasts
Definition
bone reabsorbing cells derived from monocytes
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