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Integumentary System (Functions (Protect tissues and organs, Excrete salt,…
Integumentary System
Functions
Protect tissues and organs
Excrete salt, water, wastes
Maintain body temperature
Make vitamin D
Store lipids
Detect pressure
Glands
Exocrine
Sebeceous
Sebum
Holocrine
Sweat
Merocrine
Thermoregulation
Apocrine sweat glands
Armpits
Nipples
Groin
Mammary
Milk
Ceruminous
Protect eardrum
Earwax
Repair of skin
Inflammation
Migration
Cells of stratum basale migrate along the wound
Proliferation
Scarring
Accessory structures
Derived from embryonic epdermis
Project through skin surface
Examples
Hair
Nails
Hair follicle
Sebaceous glands
Sweat glands
Cutaneous membrane
Outer epidermis
Superficial epithelial tissue
5 layers from basement membrane to free surface
Stratum basale
Deepest layer
Stem cells
Bonds epidermis and dermis
Stratum corneum
Exposed skin surface
Inner dermis
Connective tissues
Components
Outer papillary layer
Areolar tissue
Capillaries
Sensory neurons
Lymphatics
Deep reticular layer
Dense irregular connective tissue
Blood vessels
Lymph vessels
Nerve fibres
Collagen
Elastic fibres
Connective tissue proper
Characteristics
Strong
collagen fibres
Elastic
elastic fibres
Flexible
skin turgor
Skin colour
Pigments
Carotene
Melanin
Extent of blood circulation
Hypodermis
Loose connective tissue