Skin Anatomy 1 Flashcards

1
Q

Outline melanin production function of skin

A

Produces melanin, which protects underlying tissue from ultraviolet radiation

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2
Q

Outline keratin production role of skin

A

Produces keratin, which protects against abrasion and serves as a water repellent

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3
Q

Outline skin lipid storage role

A

Stores lipids in adipocytes in the dermis and in adipose tissues in the subcutaneous layer

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4
Q

Outline detection function of skin

A

Detect touch, pressure, pain, and temperature stimuli, and relay that information to the nervous system

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5
Q

What tissue types is skin made up of

A

All 4 tissue types.
Epithelial, connective, muscle, and nervous tissues

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6
Q

What are the 3 primary layers of skin

A

Epidermis - outer skin
Dermis - skin
Hypodermis - bellow skin

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7
Q

3 features of epidermis

A

Stratified barrier
Mostly keratinocytes (protein cells)
No blood circulation - a vascular

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8
Q

2 features of Dermis

A

Protein fibres for strength (collagen and elastin)
Vascular (nourishes epidermis)

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9
Q

Feature of Hypodermis

A

Adipose tissue

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10
Q

What tissue dominates in the epidermis

A

Epithelial tissue

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11
Q

Simple vs Stratified tissues

A

Simple - single layer of tissue cells
Stratified = stacked layers of tissue cells

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12
Q

3 types of epithelia

A

Squamous - squashed/scales
Cuboidal
Columnar

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13
Q

4 layers of epidermis, from superficial to deep

A

Stratum corneum
Stratum granulosum
Stratum spinosum
Stratum basale

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14
Q

Stratum corneum cell types

A

Dead, dried out hard cells without nuclei

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15
Q

Stratum granulosum cell types

A

Contains granules that promote cell dehydration. cross linking of keratin fibre (dead cells cannot attach to eachother). Waxy material secreted into the intercellular spaces

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16
Q

Stratum spinosum cell type

A

Intercellular bridges (desmosomes) link cells together within epidermis
Cells become increasingly flattened as the move upward

17
Q

Stratum basale cell type

A

Columnar regenerative stem cells. As basal cell decides, a daughter cell migrates upwards to replenish the layer above

18
Q

Desmosomes vs Hemidesmosomes

A

Desmosomes - anchor adjacent/neighbouring cells within the epidermis
Hemidesmosomes - anchor stratum basale to the dermis

19
Q

Outline thin skin

A

4 layers
“Come get some burgers”
Top layer is dead (stratum corneum)

20
Q

Outline thick skin

A

5 layers
“Come lets get some hand burgers”
Found of palms of hands and feet
No hair
Extra epidermal layer - stratum lucidum
Outer 2 layers are dead (stratum corneum and stratum lucidum)

21
Q

Outline the dermis

A

Situated below the epidermis and anchors via Hemidesmosomes
Is not shed
Divided into two layers - papillary layer and reticular layer
Both layers contain blood vessels, lymphatics, sensory nerve fibres, and accessory structures

22
Q

Papillary layer vs reticular layer

A

Papillary layer - consists of highly vascularised tissues (for nourishment)
Reticular layer - mesh like structure of collagen and elastin fibres (for strength)

23
Q

Two plexuses of the dermis

A

Cutaneous plexus
Subpapilliary plexus

24
Q

Cutaneous plexus

A

Network of blood vessels present at the junction of dermis/hypodermis.
Supplies the hypodermis, deeper dermis, including the capillaries for hair follicles and sweat glands

25
Q

Subpapillary plexus

A

Branches from the cutaneous plexus
Lies deep to the papillary layer of the dermis
Network of blood vessels providing O2 and nutrients to the upper dermis and epidermis

26
Q

Define plexus

A

Plexus refers to a network of blood vessels or nerves

27
Q

Outline the hypodermis

A

The “subcutaneous” layer
Classical anatomy does not consider as a part of skin (hubs192 does)
Dominated by adipocytes that produce subcutaneous fat
The subcutaneous fat stores energy and provides insulation
Common site of injections using hypodermic needles

28
Q

What fat is consumed during fasting

A

Subcutaneous fat stores are consumed during fasting

29
Q

Outline first degree burns

A

Superficial only - only involve outer layers of the epidermis
Red/pink, dry, painful
Usually no blisters
Skin remains a water and pathogenic barrier
Usually heals within 3-10 days

30
Q

Outline a normal second degree burn

A

Epidermis + varying amounts of dermis
Painful, moist, red, and blistered
Usually heals in approx 1-2 weeks (needs good dressing)

31
Q

Outline a deeper second degree burn

A

May include whiteish, waxy looking areas
Hair follicles, sweat glands may remain intact
Usually heal in one month
May have some loss of sensation and scaring

32
Q

Outline a third degree burn

A

full thickness burn - extends into subcutaneous tissue, may involve muscle/bone.
Varied colour from waxy white through to deep red or black
Hard, dry and leathery skin
No pain in these areas as sensory nerve endings are destroyed
May require skin draft
Weeks to regenerate + scaring