The thick inner layer of skin beneath the epidermis, containing blood vessels, nerve endings, hair follicles, and connective tissue made mostly of collagen.
From Greek 'derma' (skin). This anatomical term has been used since ancient times but became standardized in modern medical terminology during the Renaissance.
The dermis is where all the interesting skin stuff happens—it's packed with collagen, which is why it's where dermatologists inject fillers to smooth wrinkles, and why sun damage to the dermis causes permanent aging.
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