Lab 5 Flashcards
Epidermis mainly made of
Keratinized stratified squamous epithelium
Dermis made of
Connective tissue
Hair follicles
Glands
Sensory receptors
Hypodermis does
Attaches skin to underlying tissues
Provides insulation
Most of cells in epidermis are
Keratinocytes
Melanocytes
Produce melanin
Thick skin
Five layers
Found in fingertips, Palms of the hands, soles of feet
Thin skin
Four strata
Covers rest of body
Layers of thin skin
Stratum corneum
Stratum granulosum
Stratum spinosum
Stratum basale
Thick skin layers
Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum spinosun
Stratum basale
Stratum corneum
Dead cells
Protection
Stratum lucidum
Translucent layer of cells
Stratum granulosum
Keratin formation begins in this layer and cells begin to die
Stratum spinosum
Cells get spiny look
Stratum basale
Cells rapidly multiplying
Layers of dermis
Papillary layer
Reticular layer
Papillary layer
Bumpy
Loose connective tissue
Tactile corpuscles
Tactile corpuscles
Receptors for touch
Numerous in lips, fingertips, eyelids
Reticular tissue
Dense irregular connective tissue
Lamellated connective tissue
Lamellated corpuscles
Deep pressure and vibration receptors
Hypodermis
Made of adipose tissue and areolar connective tissue
Types of sweat glands
Escribe sweat glands
Apocrine sweat glands
Eccrine sweat glands
Numerous in hands, feet, forehead
Ducts pass to surface of skin
Apocrine sweat glands
Found in axillary and anogenital regions
Secrets product into hair follicles
Hair is composed of
Keratin
Sebaceous glands
Secrete sebum onto hair
Sebum
Protects and lubricates hair
Rule of nines
Burns with 20% or more are life threatening
First degree burns
Only epidermis
Redness
Heals in one week
No scarring
Second degree burn
Epidermis and part of dermis
Accessory structures intact
Blistering
2 weeks to 2 months
Some scarring may occur
Third degree burn
All the way to hypodermis and tissues beneath
Painless
Healing cannot occur
Skin grafting usually required
Infections likely and life threatening
Basal cell carcinoma
Most common
Stratum basale
Rarely spreads
Small shiny bump
Squamous cell carcinoma
Stratum spinosum
Can spread to lymph nodes
Lesions are raised reddened and scaly
Malignant melanoma
Most deadly
Often arises from the melanocytes of a pre-exsisting mole
Spreads quickly and drug resistant