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How does granulation tissue form in a healing wound?
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Granulation tissue is a delicate, vascularized connective tissue that forms during the repair process when tissue damage is substantial or cannot be regenerated successfully. It is named for the small, red granular appearance it creates in healing areas, such as the skin beneath a scab.12
The formation of granulation tissue involves several key biological events:
- Angiogenesis: Endothelial cells give rise to new blood vessels through a process called angiogenesis, which establishes circulation in the healing area.13
- Fibroblast Activity: Cells known as fibroblasts migrate to the site and grow to form a loose framework of connective tissue.12
- Collagen Production: As repair progresses, these fibroblasts produce collagen, which provides mechanical strength to the growing tissue.1
Over time, this process leads to the formation of a scar consisting of densely packed collagen, eventually replacing the temporary granulation tissue.1