Dermis - inner layer of the skin, contains connective tissue with elastic fibers, hair follicles, sweat glands, sebaceous glands, blood capillaries, lymphatic vessels, and nerve endings.
The Epidermis has 2 layers what are they?
Cornified Layer and Malpighian Layer
Epidermal cells have no nuclei or organelles except mitochondria. They contain keratin which gives them strength and waterproofing properties.
Melanin pigment protects against UV (ultraviolet light) radiation by absorbing it.
Skin color varies due to differences in melanin production.
Cornified Layer - consist of dead toughened cells, contains a fibrous protein called keratin, renews constantly when dead cells are rubbed off, waterproof protecting lower tissue from drying out and protects underlying tissue from friction and entry of pathogens (bacteria etc.)
Malpighian Layer - forms a granular layer where cells contain tiny granules filled with proteins, contains melanin.
Blood capillaries in the dermis..
supply living part of the skin with nutrients and oxygen
Hairs in the dermis..
enclosed in a hair follicle/ is made at the base of it, pigment is laid down here, hair turns grey when pigment is lost
Hair erector muscle in the dermis...
each hair has a muscle which pulls on the hair when it contracts
Sebaceous glands in the dermis...
secretes oily sebum into hair follicles keeping hair and epidermal cells flexible and prevents skin from cracking
Sweat Glands in the dermis
produce sweat that enters a duct and passes to the skin surface via the sweat pore
