1. Integumentary System

3. Skin (Integument) External body covering Functions Layers Insulation
Protects
Prevents water loss
Temperature regulator
Vitamin D
Senses
Layers
Epidermis, dermis

4. Layers of the Epidermis
Stratum corneum-dead cells
Stratum lucidum -thin layer of flat, dead keratinocytes
Stratum granulosum -flattened cells; lamellated granules
Stratum spinosum-cells rapidly divide
stratum basale -actively dividing; contain melanocytes

6. Dermis Between dermis and subcutaneous layer
Dense irregular connective tissue
Layers
Papillary layer -areolar connective tissue; fingerprints (epidermal ridges); touch receptors (meissner’s corpuscles)
Dermal papillae-attach dermis to epidermis
Reticular layer -deepest; dense irregular connective tissue; sweat, sebaceous glands, pressure receptors (Pacinian corpuscles)

8. Hypodermis
Below integument
Stabilizes
Deposits of fat

9. Hair Protects Protection of openings Sensitive to touch
Hair follicle -dense connective tissue sheath; produces nonliving hair
Hair root -lower part of hair; attached to skin
Hair shaft -upper part; not attached
Arrector pili muscle -muscle attached to hair follicle

10. Cutaneous glands
Sebaceous glands -lubricates skin (oil and sweat)
Eccrine glands -perspiration
Apocrine glands -found in armpits and genital areas; produce odor

11. Human scalp