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General Points Of SkinGeneral Points Of Skin

Layers Of SkinLayers Of Skin

• Skin is composed of 3 layers1) Epidermis

2) Dermis

3) Hypodermis or Subcutis

EpidermisEpidermis

• Outermost layer of skin

• Derived from basal membrane Stratum Basale

• Presents the openings of hair follicles

• Epidermis consists of 4 sublayers1. Stratum Corneum – Outermost Horny Layer

2. Stratum Lucidum – Clear Layer

3. Stratum Granulosum – Granular Layer

4. Stratum Spinosum – Prickly Cell Layer

DermisDermis

• Supports the Epidermis

• Consists of Collagen,Reticular & Elastic fibers

• Modify the structure & function of EpidermisPlay role in

• Strength & Elasticity of skin

• Maintenance & Repair of skin

Hypodermis/SubcutisHypodermis/SubcutisConsists 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

Fat Cells

Functions Of SkinFunctions 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(with the help of sunlight)҉: The protective function of the skin is enhanced by

the presence of sebum & sweat that spread over the cells of the stratum corneum

Comparative Points Of SkinComparative Points Of Skin

ThicknessThickness

Greater than that of any other domesticated animal

Cutaneous GlandsCutaneous Glands

Larger than that of any other domesticated animal

Sebaceous GlandsSebaceous Glands

Sudoriferous/Sweat GlandsSudoriferous/Sweat Glands

Naso Labial GlandsNaso Labial Glands

HairsHairs