Introduction to Dermatology Flashcards
What is the function of the subcutis?
Fat energy store
Insulation
Fibrous bands to anchor skin
What are the layers of the epidermis?
Stratum corneum Stratum lucidum Stratum granulosum Stratum Spinosum Stratum basale
What is the structure of stratum corneum?
Dead cells with hard protein envelope
Cells contain keratin
What is the structure of stratum lucidum?
Dead cells within dispersed keratohyalin
What is the structure of stratum granulosum?
Hard protein envelope
Lamellar bodies release lipids
Cells die
What is the structure of stratum spinosum?
Keratin fibres and lamellar bodies accumulate
What is the structure of stratum basale?
Cells divide by mitosis
What is the most distal part of the nail called?
Hyponychium
What is the biconvex white structure of the proximal nail called?
Lunula
What is the hair cycle?
Anagen
Catagen
Telogen
What is anagen?
Active growing phase
30-90% of hair
What is catagen?
2-3 week phase growth stops
1-3% of hairs
What is telogen?
Resting phase 1-4 months
10% of hairs in a normal scalp
What are the functions of the skin?
Barrier Thermoregulation Skin immune system Sensation Vitamin D synthesis Interpersonal communication
What are the external causes of skin disease?
Temperature UV Chemical Infection Trauma