Integumentary
The integumentary system is the human body's external barrier covering comprising the cutaneous membrane (epidermis and dermis) and appendages (hair, nails, exocrine sweat and sebaceous glands).
Quantitative Metrics & Physiological Scale
Total cutaneous barrier shield sealing internal tissue fluids
The single heaviest individual organ system in the human body
Basal layer keratinocyte proliferation to stratum corneum desquamation
Thermo-effective evaporation cooling glands distributed over skin
Physiological Role & Homeostasis
Mechanical abrasion protection, antimicrobial acid mantle, and UV photoprotection
Thermoregulatory control via capillary arteriovenous shunts and sweat evaporation
Tactile, nociceptive, and thermal somatosensory reception plus Vitamin D3 biosynthesis
Epidermis vs Dermis Anatomical Layers
| Feature / 比较维度 | Epidermis / 表皮层 | Dermis / 真皮层 |
|---|---|---|
| Tissue Architecture / 组织学基本构型 | Avascular keratinized stratified squamous epithelium / 无血管的角化复层扁平上皮（角质/透明/颗粒/棘/基底层） | Vascularized dense irregular connective tissue / 富含血管的致密不规则结缔组织（乳头层与网状层） |
| Vascular Supply / 血液供应与营养方式 | Avascular; nourished entirely by diffusion from dermal papillae / 无毛细血管；完全依赖真皮乳头层微血管渗透弥散提供营养 | Extensive microvascular plexus with thermoregulatory shunts / 极其丰富的浅表与深层毛细血管网及动静脉温控吻合支 |
| Biomechanics & Durability / 力学特性与主要功能 | Waterproof seal, pathogen barrier & friction resistance / 疏水密封、防止水分丢失、隔绝微生物与耐受表面磨损 | Elasticity and massive tensile tear strength (Collagen I & Elastin) / 胶原纤维赋予强韧抗拉伸力，弹性纤维保证变形回弹 |
Vital Organs & Structures
How to Study This System in 3D
Toggle visibility of the skin layer to immediately reveal superficial skeletal muscles and cutaneous veins.
Adjust transparency to observe how subcutaneous fat cushions deeper investing muscular fascia.
Explore Synergistic Anatomical Systems
For educational use only; not medical advice, diagnosis, or treatment.