BYBY
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