The skin is composed of three layers: the epidermis, dermis, and hypodermis. The epidermis is the outermost layer and consists of four sublayers including the stratum corneum. The dermis lies below the epidermis and consists of collagen, elastic, and reticular fibers that modify the structure and function of the epidermis. The deepest layer, the hypodermis, consists of connective tissue, elastic fibers, and fat that act as an energy reserve, insulator, and determine body contour. The skin has several important functions including protection, thermoregulation, and vitamin D synthesis.

1. BY

2. General Points Of Skin

3. Layers Of Skin
• Skin is composed of 3 layers
1) Epidermis
2) Dermis
3) Hypodermis or Subcutis

5. Epidermis
• Outermost layer of skin
• Derived from basal membrane Stratum Basale
• Presents the openings of hair follicles
• Epidermis consists of 4 sublayers
1. Stratum Corneum – Outermost Horny Layer
2. Stratum Lucidum – Clear Layer
3. Stratum Granulosum – Granular Layer
4. Stratum Spinosum – Prickly Cell Layer

7. Dermis
• Supports the Epidermis
• Consists of Collagen,Reticular & Elastic fibers
• Modify the structure & function of Epidermis
Play role in
• Strength & Elasticity of skin
• Maintenance & Repair of skin

9. Hypodermis/Subcutis
Consists of
• Connective tissue
• Elastic fibers
• Fat - when fat forms a layer of considerable
thickness,it is termed as Peniculus Adiposus
Act as
• Energy Reserve
• Insulator
• Body Contour
 More subcutaneous tissue = Skin is raised
 Less subcutaneous tissue = Skin is adherent to
subjacent structures

10. Fat Cells

11. Functions Of Skin
• Preservation of the animal's shape
• Protection against water loss
• Protection from physical, chemical &
microbial injury imposed by external agents
• Thermoregulation
• Vitamin D synthesis (By Sunlight)
҉ The protective function of the skin is enhanced
by the presence of sebum & sweat that spread
over the cells of the stratum corneum

12. Comparative Points Of Skin

13. Thickness
Greater than that of
any other
domesticated animal

14. Cutaneous Glands
Larger than that of
any other
domesticated animal

15. Sebaceous Glands

16. Sudoriferous/Sweat Glands

17. Naso Labial Glands

18. Hairs