Integumentary System
Overview
The skin and its accessory structures constitute the integumentary system
Skin
* Large waterproof covering
*Largest organ in the body
*UV and chemical protection
*The layers of skin include epidermic, dermis and hypodermis
Accessory structures
-Hair, nails, skin glands
The layers of the skin
*Epidermis [ Upper layer]
*Dermis [Lower layer]
Dense connective tissue
Connects skin to fat and muscle
*Hypodermis [Subcutaneous layer below dermis]
Loose connective tissue and adipose tissues
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Layers of Epidermis
1. Stratum corneum
-Outermost layer
-Dead, keratinized cells
-Barrier to light, heat, chemicals, microorganisms
2. Stratum lucidum
-One/ two cells layers thick
-Flat and transparent
-Difficult to see
3.Stratum granulosum
-Two/three layers
-Flattened cells
-Active keratinization
-Lose nuclei [dying off]
-compact and brittle
4.Stratum spinosum
Several layers of spiny-shaped cells
Contain Desmosomes [interlocking cellular bridges which held together cells]
