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Osseous Tissue and Bone Structure
NA
25
Physiology
Undergraduate 2
06/18/2012

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Term
SUTURAL BONES
Definition
Small, irregular bones found between the flat bones of the skull
Term
IRREGULAR BONES
Definition

Have complex shapes

Examples are: spinal vertebrae, pelvic bones

Term
SHORT BONES
Definition

small and thick

Example: ankle and wrist bone

Term
FLAT BONES
Definition
Thin with parallel surfaces found in the skull, sternum, ribs, and scapulae
Term
LONG BONES
Definition

long and thin

found in arms, legs, hands, fingers, feet, and toes

Term
SESAMOID BONES
Definition
Small and flat that develop inside tendons near joints of knees, hands, and feet
Term
DIAPHYSIS
Definition
The shaft; a heavy wall of compact bone, or dense bone
Term
EPIPHYSIS
Definition
Wide part at each end of bone; mostly spongy (cancellous) bone
Term
METAPHYSIS
Definition
Where diaphysis and epiphysis meet
Term
FLAT BONE
Definition
Resembles a sandwich of spongy bone; Between two layers of of compact bone
Term
CANALICULI
Definition
Form pathways for blood vessels; Exchange nutrients and waste
Term
VITAMINS K AND B12
Definition
Help synthesize bone proteins
Term
OSTEOCYTES
Definition
Mature bone cells that maintain the bone matrix; Do not divide
Term
TWO MAJOR FUNCTIONS OF OSTEOCYTES
Definition

1. To maintain protein and mineral content of matrix

2. To help repair damaged bone

Term
OSTEOBLASTS
Definition
Immature bone cells that secrete matrix compounds (osteogenesis); osteoblasts surrounded by bone become osteocytes
Term
OSTEOPROGENITOR CELLS
Definition
Mesenchymal stem cells that divide to produce osteoblasts; assist in fracture repair
Term
OSTEOCLASTS
Definition
Secrete acids and protein-digesting enzymes; dissolve bone matrix and release stored minerals (osteolysis)
Term
HOMEOSTASIS
Definition
Bone building (by osteoblasts) and bone recycling (by osteoclasts) must balance
Term
OSTEON
Definition
The basic unit of compact bone
Term
FUNCTIONS OF PERIOSTEUM
Definition

1. Isolates bone from surrounding tissues

2. Provides a route for circulatory and nervous supply

3. Participates in bone growth and repair

Term
OSSIFICATION
Definition
The process of replacing other tissues with bone
Term
ENDOCHONDRAL OSSIFICATION
Definition
Ossifies bones that originate as hyaline cartilage; most bones originate as hyaline cartilage
Term
INTRAMEMBRANOUS OSSIFICATION
Definition
Also called dermal ossification; Produces dermal bones such as mandible (lower jaw) and clavicle (collarbone)
Term
VITAMIN C
Definition
Required for collagen synthesis, and stimulation of osteoblast differentiation
Term
VITAMIN A
Definition
Stimulates osteoblasts activity
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