Integumentary System Flashcards
What percentage does the integumentary system make up in our body weight?
16%
What are the 6 functions of the integumentary system?
Protect underlying tissues and organs
excretes salts, water, organic wastes
maintains body temperature
stores lipids
synthesize vitamin D3
Detects touch, pressure, pain, and temperature
What are the 2 parts of the integument?
Cutaneous and accessory structures
Includes the epidermis and dermis
Cutaneous
Includes the hair, nails, and exocrine glands
Accessory structures
Glands that secretes onto surfaces and ducts
Exocrine gland
What are the 2 regions of the cutaneous membrane?
Epidermis and dermis
Outermost protective shield, 4-5 layers of stratified squamous cells, avascular
Epidermis
What part of the cutaneous membrane is the origin of accessory structures?
Epidermis
What type of tissue make up the epidermis?
Epithelium
What type of tissue make up the dermis?
Connective
Tough leathery layer, vascular
Dermis
What are the functions of the hypodermis?
Stabilize and support integument
What type of tissues make up the hypodermic?
Areolar and adipose
What does loose connective tissues function for the hypodermic?
Insulation, shock absorption, energy storage
How many layers does thin skin have and where is it located?
4; most of body
How many layers does the thick skin have and where is it located?
5; palms, fingertips, soles of feet
What are the layers of the epidermis from superficial to deep?
Stratum corneum, Stratum lucidum, stratum granulosum, stratum spinosum, stratum basale
Mitotic stem cells; 25% of these cells are melanocytes
Stratum basale
Infrequent mitosis
Stratum spinosum
Transition layer where keratinization begins
Stratum granulosum
Present only in thick skin
Stratum lucidum
15- 30 cells thick, continuously shed, keratinized
Stratum corneum
Formation of a superficial layer of dead, tough, protective cells with keratin
Keratinization