THE SKELETAL SYSTEM FUNCTIONS OF BONES SUPPORT: THEY PROVIDE A FRAMEWORK PROTECTION: THE SKULL...
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Transcript of THE SKELETAL SYSTEM FUNCTIONS OF BONES SUPPORT: THEY PROVIDE A FRAMEWORK PROTECTION: THE SKULL...
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THE SKELETAL SYSTEM
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FUNCTIONS OF BONES
• SUPPORT: THEY PROVIDE A FRAMEWORK• PROTECTION: THE SKULL PROTECTS THE BRAIN & THE
VERTEBRAE PROTECT THE SPINAL CORD, ETC.• MOVEMENT: BONES ACT AS LEVERS TO MOVE THE
BODY• MINERAL STORAGE: BONES ACT AS A RESERVOIR FOR
Ca AND P• BLOOD CELL FORMATION: MOST BLOOD CELL
FORMATION OCCURS WITHIN THE MARROW OF BONES.
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CLASSIFICATION OF BONES
• ARE LONGER THAN WIDE
• E.g.. BONES OF THE LIMBS, EXCEPT PATELLA, BONES OF WRIST & ANKLE
LONG BONES
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SHORT BONES
• ARE ROUGHLY CUBELIKE..
• E.g.. BONES OF WRIST & ANKLE
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• ARE THIN• FLATTENED
• A BIT CURVED• E.g.. MOST SKULL BONES
FLAT BONES
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• FIT NONE OF THE OTHER CLASSES.
• E.g.. VERTEBRAE & HIP BONES
IRREGULAR BONE
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TERMS• EPIPHYSES- SWOLLEN ENDS OF THE BONE
• DIAPHYSIS- SHAFT OF THE BONE
• EPIPHYSEAL PLATE- AREA OF A BONE WHERE GROWTH OCCURS IN CHILDHOOD.
• MEDULLARY CAVITY- THE CENTER OF A BONE
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• IN ADULTS, THE MEDULLARY CAVITY IS FILLED WITH YELLOW MARROW.
• YELLOW CAN CONVERT TO RED, WHICH MAKES NEW BLOOD CELLS, IF A PERSON BECOMES VERY ANEMIC.
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SLIDE OF BONE TISSUE
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OSTEOGENESIS
• IS THE PROCESS OF BONE FORMATION
• AT 6 WEEKS, THE SKELETON IS FIBROUS MEMBRANE AND CARTILAGE WHICH ARE FLEXIBLE. (this is important for the fetus to get through the birth canal)
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fetus just prior to birth
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HORMONAL IMBALANCES
GH (growth hormone) is a hormone that is important in bone
growth.
DWARFISM: TOO LITTLE GH
GIANTISM: TOO MUCH GH
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DWARFISM
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GIANTISM
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BONE BREAKAGE
IS THE MOST COMMON BONE DISORDER
***PLEASE NOTE
(some of these pictures of fractures are graphic, so please do not view if you are uncomfortable; pictures follow the information about each
type of break)
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COMMON TYPES OF FRACTURES
• SIMPLE• COMPOUND
• COMMINUTED• COMPRESSION
• DEPRESSED• IMPACTED
• SPIRAL• GREENSTICK
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SIMPLE FRACTURE
• ALSO CALLED A CLOSED FRACTURE
• BONES BREAK CLEANLY BUT DO NOT PENETRATE THE SKIN
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COMPOUND FRACTURE
• MORE SERIOUS THAN SIMPLE• BROKEN ENDS OF BONE PENETRATE THE
SKIN• BONE INFECTIONS KNOWN AS
OSTEOMYELITIS ARE POSSIBLE• ANTIBIOTICS ARE REQUIRED
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click to view photograph of
compound fracture.
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click to view photograph of compound fracture
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COMMINUTED FRACTURE
• BONE FRAGMENTS INTO MANY PIECES• COMMON IN THE AGED WHERE BONES
ARE BRITTLE
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COMMINUTED FRACTURE
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COMPRESSION FRACTURE
• BONE IS CRUSHED
• COMMON IN POROUS BONES (THOSE WITH OSTEOPOROSIS)
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DEPRESSION FRACTURE
• BONE IS PRESSED INWARD
• TYPICAL OF SKULL FRACTURE
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IMPACTED FRACTURE
• BROKEN BONE ENDS ARE FORCED INTO ONE ANOTHER
• COMMON WHEN TRYING TO BREAK A FALL WITH ONE’S ARM
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Mrs. Adams – a 67 year old female who fell on the ice
This is an impacted, comminuted fracture of the distal end of the radius.
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SPIRAL FRACTURE
• RAGGED BREAK THAT OCCURS WITH A TWIST TO THE BONE
• COMMON SPORTS FRACTURE
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GREENSTICK FRACTURE
• BONE BREAKS INCOMPLETELY
• COMMON IN CHILDREN WITH FLEXIBLE BONES
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http://www.wisc-online.com/objects/index_tj.asp?objID=NUR1303
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