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Morphology of aged skin.
R M Lavker1, P S Zheng, G Dong
1Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia.
Clinics in Geriatric Medicine
|February 1, 1989
Summary
Aging skin retains its protective barrier function despite epidermal thinning. However, dermal changes significantly impact skin fragility and wrinkling due to altered collagen and elastin.
Area of Science:
- Dermatology
- Gerontology
- Skin Aging Research
Background:
- The aged epidermis exhibits minimal changes, maintaining its protective and barrier functions.
- Key markers of keratinization remain unaltered in senile skin.
- Stratum corneum integrity suggests preserved barrier ability in aging skin.
Purpose of the Study:
- To investigate the morphologic and functional changes in aged skin.
- To differentiate between epidermal and dermal alterations in the aging process.
- To understand the physiological consequences of these age-related skin changes.
Main Methods:
- Morphologic examination of aged skin tissues.
- Histological analysis of epidermal and dermal components.
- Evaluation of keratinization markers and dermal architecture.
Main Results:
- Epidermis shows thinning and focal atypia but retains barrier function.
- Dermal-epidermal junction flattens, increasing tissue fragility and reducing proliferative capacity.
- Dermal collagen and elastin networks are altered, leading to reduced elasticity and increased wrinkling.
Conclusions:
- While the aged epidermis maintains barrier function, dermal structural changes significantly compromise skin integrity.
- Flattening of the dermal-epidermal junction contributes to fragility and reduced healing.
- Alterations in dermal fibrous components result in loss of elasticity and increased susceptibility to wrinkling.