Dermis
What are the two layers of the dermis?
Papillary and Reticular
What is the most superficial layer of the epidermis?
Stratum Corneum
What is the function of Keratinocytes?
produce keratin, give skin toughness and has waterproofing effects
What are human hairs made of?
Dead hard keratinized cells
secrete sweat
What are flexure lines?
Dermal folds that occur near areas on or near joints (ex. deep creases on palms)
Which layer of the epidermis is only present in thick skin
Stratum Lucidum
Which cell of the epidermis provides an immune response?
dendritic/langerhans cell
Which region of a hair is exposed to the environment and which region of a hair is embedded in the dermis?
shaft, root
What do your ceruminous glands secrete?
cerumen/earwax
What type of tissues make up the papillary and reticular layers? (hint: it's not reticular tissue)
Areolar, dense irregular connective tissue
Which layer of the epidermis has continuously dividing stem cells which replenish the epidermis.
Stratum Basale
What is the function of Melanocytes, and why do they produce this substance?
Produce melanin, protect against UV radiation
What is the name of the muscle that makes your hairs stand on end?
Arrector pilli
Holocrine glands
What aspect of the dermis creates the friction ridges that make up your fingerprints?
What layer waterproofs the skin, and what kind of junction is responsible for this
Stratum Granusolum, tight junctions
In which layer are keratinocytes of the epidermis generated?
Stratum Basale
What are the layer of a hair shaft from superficial to deep?
cuticle, cortex, medulla
What do sebaceous glands secrete and why do they secrete this substance?
sebum, softens and lubricates skin and is antibacterial
What gives your skin it's cleavage (tension) lines
Collagen fibers in the reticular layer
List the layers of the epidermis from deep to superficial.
Stratum, basale, spinosum, granulosum, lucidum, corneum
List all 4 main cells in the epidermis and their functions
Keratinocytes, merkel cells, dendritic cells, and melanocytes.
What are the two types of hair, and where are those types seen on humans
vellous, terminal
What are the differences between eccrine and apocrine glands?
location and secretion type.