Integumentary system Flashcards
Layers of the skin
Epidermis
Keratinatized squamous epithelium
Top most layer of the skin
Cells of the epidermis
Keratinocytes
produce keratin that hardens and waterproofs the skin
Cells of the epidermis
Melanocytes
produces melanin that protects fron UV radiation
Cells of the epidermis
Langerhans cells
macrophages coordinating with WBC during immune responses
Cells of the epidermis
Merkel cells
- Occur at the epidermal-dermal boundary
- Form merkel discs for sensory function
Layers of epidermis
C L G S G
- Stratum corneum
- Stratum lucidum
- Stratus granulosum
- Stratus spinosum
- Stratus basale/germativum
C L G S G
Layers of the skin
Dermis
- Connective tissue with fibroblasts and macrophages within a gelatinous matrix
- provides strength, extensibility, elasticity
- contains the sweat glands, oil glands, and hair follicles
Layers of the dermis
P R
- Papillary dermis
- Reticular dermis
P R
Layers of the dermis
Papillary dermis
- Thin outer layer of areolar connective tissue
- Contains dermal papillae
Dermal papillae - hair growth
Layers of the dermis
Reticular dermis
- Contains vessels, glands, follicles, lymphatics, nerves and fat cells
- Surrounded by reticular structure of elastin fiber
Layers of the skin
Hypodermis
- Subcutanous fat tissue
- acts as insulation, energy storage, and the connection from skin to muscle
Accessory organs
- Hair
- Nails
- Sebacous glands
- Sudoriferous glands
- Ceruminous glands
- Mammary glands
Glands ( S S C M)
Accessory organs
hair
elongated filaments of keratinized epithelial cells
Accessory organs
nails
keratinized epithilial cells
Accessory organs
sudoriferous glands
secretes sweat
eccrine glands - pores
apocrine glands - hair follicles
