Integumentary System
외피계
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<speciesfyi-glossary slug="integumentary-system"></speciesfyi-glossary>Definition
The organ system forming the outer covering of the body, including skin, scales, feathers, hair, and nails.
Detailed Explanation
The integumentary system is the body's first line of defense against pathogens, UV radiation, and dehydration. Its evolutionary diversity is remarkable: fish scales are modified from the same developmental pathway as teeth; bird feathers are highly derived reptile scales; mammalian hair traps insulating air. Skin also plays roles in communication — color-changing cephalopods and flushing primates convey social signals through integument.