Sebaceous
gland
edidermis
Arrector
pili muscle
Papillary layer of dermis
Hair follicle
Reticular layer of dermis
Hair follicle
Receptor
hypodermis
Pacinian
Corpuscle
Epidermis: the outermost layer of skin. Not
Dermis: 2 layers
vascular* all nutrition via diffusion from the dermis, Papillary: made of areolar CT, papillae push into
made of Keratinized Stratified squamous epithelium. the epidermis to help with attachment, resulting in
peaks and valleys in the epidermis making
fingerprints. Contains capillaries, pain receptors,
Made of 4 types of tissue (5 in thick skin like soles
and touch receptors (Meissner’s corpuscles)
of feet and palms of hands)
Reticular: made of dense irregular CT. Contains
1. Stratum basale the deepest layer, contains
blood vessels, contains collagen which provides
strength.
melanocytes, attached to the dermis papillary layer
2. Stratum Spinsosun contains Langerhans cell
(immune system)
3. Stratum granulosum cells in this layer release
lipids that slow water loss.
4. Stratum lucidum (only in thick skin like palms of
hands and soles of feet).
Below the dermis is the hypodermis which is made
up of adipose tissue, this layer is not Skin but
anchors the skin to underlying muscle and is a
layer cushion (absorb shock)/insulation.
5. Stratum Corneum protects and waterproofs
keratinocytes contained in this layer
 Eccrine glands are thermoregulators and they cool the body.
 The sebaceous gland lubricates to prevent friction and prevent water loss.
 Pacinian corpuscle is a touch receptor that responds to deep touch and vibrations.
 Dermal papillae attach the epidermis to the dermis and increase surface area allowing for
increased diffusion of nutrients from the dermis to the epidermis because the epidermis is
avascular.
 Arrector pili muscle when contracted causes hair to stand up in response to cold.
 Hair follicles grow hair and assist in injury repair.
 Hair follicle receptor (root hair plexus) is a touch receptor that responds to the hair being
touched.
Exocrine glands release their product into epithelial tissue.
Endocrine glands release their product into the bloodstream- hormones.