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Integumentary System

The system consisting of the skin and its accessory structures such as hair and nails.

Epidermis

The outermost layer of skin, consisting of several layers of cells.

Stratum Basale

The deepest layer of the epidermis where stem cells reside and new skin cells are generated.

Melanin

A pigment produced by melanocytes that determines skin tone and protects skin from UV radiation.

Dermis

The inner layer of skin beneath the epidermis, containing connective tissue, blood vessels, and nerve endings.

Accessory Structures

Components such as hair, nails, sweat glands, and sebaceous glands that are associated with the skin.

First-degree burn

A burn affecting only the outer layer of skin (epidermis), causing redness and minor pain.

Basal Cell Carcinoma

A type of skin cancer that originates in the stratum basale and typically forms a nodular, cratered lesion.

Squamous Cell Carcinoma

A type of skin cancer arising from keratinocytes in the stratum spinosum, often presenting as plaques that bleed or ulcerate.

Malignant Melanoma

A dangerous skin cancer originating from melanocytes, characterized by asymmetrical shape, irregular borders, and multiple colors.

Tension Lines

Gaps between collagen fibers in the reticular layer of the dermis that indicate the direction of skin tension.

Folate

A vitamin (B9) that is essential for cell division and is influenced by UV radiation exposure.

Skin Tone

The natural color of a person's skin, which depends on the amount of melanin produced.