Dermis (magnified skin block)

Dermis (corium)

Integumentary (skin)SkinLeg

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What it is

The tough connective-tissue layer under the epidermis: a thin papillary layer of loose tissue in the dermal papillae over a thick reticular layer of dense collagen and elastic fibres. It holds the vessels, nerves, hair follicles and glands (shown translucent here).

Function

Gives skin its strength and elasticity, nourishes the epidermis and houses its appendages and sensory receptors.

Size

Real thickness ~0.6 mm (eyelids) to ~3–4 mm (back)

Clinical note

Leather is tanned dermis. Stretch marks (striae) are tears in the dermal collagen; a burn is "full thickness" once the whole dermis is destroyed.