Integumentary system Flashcards Preview

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Flashcards in Integumentary system Deck (26):
1

Components of integumentary system

Epidermis, dermis, associated structures

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Layers of the epidermis

Stratum Basale
Stratum Spinosum
Stratum granulosum
Stratum lucidum (thick skin)
Stratum corneum

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Stratum Basale

Deepest layer
-Keratinocytes: regularly dividing
-Melanocytes: add pigment (melanin) increase activity by adding UV radiation
- Tactile/merkle cells: acts as sensory receptors. Sevsitve to pressure, respond by releasing chemicals that activate nerve endings

4

Stratum spinosum

Cells halt division and link up with desmosomes
-Keratinocytes
-Epidermal dentritic cells: phagocytes that eat pathogens

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Stratum granulosum

Keratinocytes accumulate more keratin which kills organelles and cells

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Stratum Lucidum

Thick skin, adds UV protection

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Stratum Corneum

20-30 layers of dead cells, regularly sloughed off and replaced

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Differences between think skin and thin skin

number of layers, thick skin has sweat glands, no hair follicles. Thin skin has hair follicles, sebaceous glads, and sweat glands

9

Dermis

Innervation and blood supply for integument
Papillary layer and Reticular layer

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Papillary Layer

Areola CT, forms dermal papillae (anchor for epidermis to dermis

11

Reticular layer

Dense irregular CT.
Blood vessels start here and move to papillary layer

12

Subcutaneous layer

Insulate, energy storage, areolar CT and adipose CT

13

Nails

Arise from the epidermis.
For protection and manipulation

14

Hair

Arise from epidermis, but penetrate dermis

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Lanugo

Covers fetal body

16

Vellus

lightly pigmented body hair

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Terminal

Heavily pigmented. on head auxiliary and pubic areas

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Hair Bulb

epithelial cells

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Hair papilla

Ct contain blood vessels and nerves

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Erector Pili

Muscle attached to hair

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Functions of Hair

-Protection (Scalp)-
-heat protection-
-Sensory reception-
-visual Identification-
-chemical signal dispersal (pheromones and Allelomones)

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Sudoriferous glands

Sweat glands
-Eccrine:Merocrine method of release, all over body

- Apocrine: Apocrine method of release, proteins, in auxiliary and pubic regions

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Subaceous glands

Release sebum: makes hair soft and pliable

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Cerumenous Glands

Ears. Release cerumen

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Functions of the Integument (epidermis)

Protection against injury, UV rays, chemicals, toxins, and microbes
-Prevention of water loss
-Metabolic regulation (Vit D)
- Secretion and absorption
-Immune function

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Functions of the Integument (dermis)

Temperature regulation
Sensory receptors
Secretion and absorption