Integumentary System

Navigational overlay for skin and its appendages. Skin is the most visible aging organ and a uniquely accessible window on aging biology: it combines intrinsic (chronological) aging with photoaging (UV-driven), making it a natural testbed for interventions (retinoids, procedural resurfacing). The dermal-epidermal compartment is rich in stem-cell, senescence, and extracellular-matrix biology.

Tissues & organs

• skin — the organ; intrinsic vs photoaging
• epidermis — outer epithelial layer; barrier function, keratinocyte turnover
• dermis — connective layer; collagen/elastin matrix, the main site of wrinkle/laxity biology

Cell types

• keratinocytes — epidermal barrier cells
• melanocytes · melanocyte-stem-cells — pigment cells; exhaustion drives hair-greying
• langerhans-cells — epidermal-resident immune sentinels (overlap with immune-system)
• dermal-fibroblasts — ECM-producing; senescence/SASP drives dermal thinning

Aging phenotypes

• skin-aging — the integrative phenotype (wrinkles, laxity, atrophy)
• androgenetic-alopecia — patterned hair loss
• hair-greying — melanocyte-stem-cell exhaustion
• cherry-angioma — benign vascular proliferation of aging skin

Key interventions & axes

• retinoids (class), tretinoin, tazarotene, bakuchiol — collagen-stimulating topicals
• Procedural: dermatologic-resurfacing, microneedling, chemical-peels
• ECM: collagen I, mmp-1; uv-protection

Auto-aggregated tissue members

LIST FROM "tissues"
WHERE parent-system = "integumentary-system"
SORT file.name

Missing / planned pages

• [[hair-follicle]], [[sebaceous-gland]], [[sweat-gland]], [[hypodermis]], [[nails]] — appendages/layers not yet seeded stub

See also

• by-organ-system — index of all body-system MOCs
• cellular-senescence — dermal fibroblast senescence is a central skin-aging driver
• immune-system — Langerhans cells are skin-resident immune cells