Epidermal layer: Epidermis is the outer protective layer without blood vessels. Dermal layer: Dermis is the inner layer containing blood vessels, sensory nerve, endings, sweat and oil glands, hair and fat cells. Functions: Skin help in providing cooling effect when sweat is produced by sweat gland. Correct Answer Epidermal layer: Epidermis is the outer protective layer without blood vessels. Dermal layer: Dermis is the inner layer containing blood vessels, sensory nerve, endings, sweat and oil glands, hair and fat cells. Functions: Skin help in providing cooling effect when sweat is produced by sweat gland.