1. The Integumentary System

2. The Skin Waterproof Self repairing Chemical Barrier Physical Barrier
Biological Barrier
Thermoregulatory

4. Cells of the Epidermis Keratinocytes- contain kerotin
Melanocytes- melanin production
Langerhans’ cells- epidermal macrophage
Merkel cells- touch receptors

6. Dermis Connective tissue Vascularized and innervated
Fibroblasts, macrophages, mast cells and white blood cells
Two layers – papillary and reticular

7. Sweat Glands Thermoregulatory role Two main types
Eccrine sweat glands – found in palms, soles of the feet, and forehead
Apocrine sweat glands – found in axillary and anogenital areas

9. Sebaceous Glands

10. Hair Structure
Made up of the shaft projecting from the skin, and the root embedded in the skin
Consists of a core called the medulla, a cortex, and an outermost cuticle
Pigmented by melanocytes at the base of the hair

11. Hair Follicle
Figure 5.5a

12. Nail
matrix
Root of
nail
Proximal
nail fold
Eponychium
(cuticle)
Body of nail
Free edge
of nail
Nail bed
Body of
nail
Free edge
of nail
Lateral
nail fold
Hyponychium
Phalanx
(bone of
fingertip)
Lunula
Eponychium
(cuticle)
(a)
(b)

13. Epithelial Membranes