unit 3 day 2 anatomy before everything else, getting ready is the secret to success. henry ford
TRANSCRIPT
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Unit 3 Day 2 Anatomy
Before everything else, getting ready is the secret to success.
Henry Ford
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Today’s Agenda
Notes on Objective 1 Epidermis
Practice labeling skinNotes on objective 2
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Epidermis is
KeratinizedStratified Of 4 cell types
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Epidermis continued Keratinocytes- make keratin protein
Melanocytes—make melanin Merkel’s cells – touch reception
Langerhan’s cell – macrophage-like
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Layers of Epidermis Totally new epidermis every 35-45 days due to
layering
Stratum Basal—basal layer Deepest layer Single row of keratinocytes Some Merkel cells 25% melanocytes Much mitosis
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Stratum Spinosum (spiny layer)
Several cell layers thick Little mitosis Keratinocytes with spine-like projections
Langerhan’s cells present
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Stratum Granulosum (granular layer)
Very thin, 2-3 layers of flattened cells
Granules of keratohyalin give its name
Keratinization begins here, as lower cells rise to this layer, die and leave keratin later to be abraded away.
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Stratum lucidium (clear layer) found only in really thick skin
Thin layer with keratohyalin and tonofilaments.
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Stratum Corneum (horny layer)
Broad layer, 20-30 cell layers thick
All dead, keratinized cells.
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1. Sebaceous gland
2. Root of the hair
3. Epidermis
4. Dermal Papilla
5. Arrector pilli
6. Dermis
7. Bulb of the hair
8. Hair follicle
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1. Covering of follicle
2. External root sheath
3. Internal root sheath
4. Cortex
5. Bulb of the follicle
6. Adipose tissue
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Spider bite
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Ringworm fungus
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Acne
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Fig. 38.3, p. 646
hair
EPIDERMIS
DERMIS
hypodermis(subcutaneouslayer)
oil glandhair follicle
blood vessels
sensoryneuron
sweat gland
smooth muscle
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Slide 3
Fig. 38.3, p. 646
hair
EPIDERMIS
DERMIS
hypodermis(subcutaneouslayer)
oil glandhair follicle
blood vessels
sensoryneuron
sweat gland
smooth muscle
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Slide 6
Fig. 38.5, p. 648
stratum corneumthe outermost layer ofepidermis; composedof dead, flattened,keratinized cells
deeper skin layers;composed of living,rapidly dividingepidermal cells
dermis
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Slide 7
Fig. 38.6, p. 649
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