Download Dermis and glands

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
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