Transcript tissue repair - andoverhighanatomy

TISSUE REPAIR
THE HEALING PROCESSbegins almost immediately
2 Ways of healing
•
1. Regenerationreplacement of old tissue by the
same types of cells
•
2. Fibrosis- repair by
dense fibrous tissue (scarring)
Tissue Injury sets a series
of events into motion
1. Capillaries become extremely
permeable- fluids rich in clotting
proteins are allowed to seep into
the injured area.
In deep tissue injuries swelling occurs
(EDEMA) in the areolar tissue in the
area.
Clotting proteins “wall off” the injured
area preventing bacteria and
harmful substances to enter.
If clot is exposed to air a SCAB will
form.
Tissue Injury sets a series
of events into motion
2. Granulation tissue forms(delicate pink tissue that
contains mostly new
capillaries)- grows into the
damaged area from nearby
undamaged blood vessels.
Contains phagocytes that will
eat away scab.
Tissue Injury sets a series
of events into motion
3. Surface epithelium
regenerates- makes its way
across granulation tissue just
beneath the scab. Scab
eventually falls off.
Ability of tissue to
regenerate
1. Epithelial tissue- regenerates
quickly and easily
2. Connective Tissue
Cartilage- will regenerate but
takes some time (weeks)
Bone- will regenerate but takes
more time (makes cartilage patch
first)
Ability of tissue to
regenerate
3. NERVOUS TISSUE- doesn’t
regenerate- becomes only scar
tissue
4. MUSCLE TISSUE- regenerates
poorly- becomes mostly scar
tissue (Examples torn
muscles, injured cardiac
tissue)