Dermis Layers of the Dermis Papillary Layer Reticular

Dermis

Layers of the Dermis �Papillary Layer �Reticular layer

Papillary Layer �Dermal papillae �Loose connective tissue �Thin fibers loosely arranged �Contain blood vessels

T-P-S Why do we have dermal papillae and not just a straight barrier? Epidermis Dermis

Reticular layer �Composed of dense irregular connective tissue �Contains both elastic and fibers and collagen fibers �Elastin and collagen are arranged in some directions more than others �Create cleavage lines

Other Dermal Components �Accessory structures �Nerve fibers and sensory receptors �Blood vessels �Lymph vessels

Glands �Sebaceous glands (oil glands) �Sweat glands (sudoriferous glands) �Apocrine sweat glands �Merocrine sweat glands (eccrine sweat glands)

Sebaceous glands � Holocrine glands �Cells produce a lot of lipids as the mature. �The cell ruptures, releasing all of its contents as a secretion � The secretion is called Sebum �Oily and waxy, inhibits bacteria � The glands usually secrete into a hair follicle �In areas without hair they can secrete directly to the surface �Acne

Sweat glands (Sudoriferous glands) � Apocrine sweat glands �Not apocrine secretion!! �Merocrine secretion �Smelly (bacteria) – found in Armpits, around nipples, and groin �Puberty � Merocrine sweat glands (eccrine sweat glands) �Merocrine secretion � 2 -5 million glands � 99% water with other organic nutrients and waste products (salt) �Thermoregulation