Skin, Hair, Nails
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Skin is both: | An organ and a system
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| Epidermis | Derived from surface ectoderm, migrate from neural tube in circumferential bands.
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| Basal Layer | Replaces the surface cells as they slough off
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| Dermis | Derived from mesoderm
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| Melanoblasts/melanocysts | Pigment of neural crest origin, located in basal layer.
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| Sebaceoius glands | secretes the sebum
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| Sweat glands | secretes the sweat
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| Mammary glands | Used to be sweat glands
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| Eumelanin | Brown tinted
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| Pheomelanin | Red color in red color in red hair, Freckles
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| Landmarks of skin | Pigmentation, Thickness, Mobility, Elasticity, Strength, Creases, Dermatoglyphs,and Blaschko's lines
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| Minor Pigmented Nevi anomalies of the Skin | Mongolian spot, Cafe-au-lait spot, Freckles, Lentigines, Hamartomatous, epidermal nevi, angiofibromas
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| Hamartomatous | Benign mix type of cells. Not in the right spot but close.
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| Minor Vascular Nevi anomalies of the Skin | Nevus Flammeus, Port wine stain, Telangiectases, Raised.
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| Deformations of the Skin | Redundant neck skin, Redundant abdominal skin, Abnormal skin creases.
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| Dysplasias of the Skin | Cutis Laxa, Hyperelasticity, Ichthyosis, Epidermolysis bullosum, Hypopigmentation, Hyperpigmentation, Premature thelarche, Absence of the sweat glands.
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| Malformations of the Skin | Cutis Aplasia, Focal Dermal hypoplasia, Skin Tumors - Neurofibromas, Plexiform neurofibromas, Lipomas, Xanthomas, Nevi, Shagreen Pathes, Hypopigmentation - ash-leaf spots, Piebaldism, Vitiligo, Hyperpigmentation, Poikiloderma.
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| Incontinentia pigmenti: What is it and the 4 stages. | X-Linked Dominant, Lethal in males, Any female is a mosaic.
1.) Born with blisters, 2.) Develop raised lines, 3.) Settles to streaky lines, 4.) Linear hypopigmenetation.
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| Hypomelanosis of Ito | Multigenic, Even male to female ratio
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| Poikiloderma | Mixture of Hypo, Hyper and Normal skin color.
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| Peutz-Jehger syndrome | Brown/black macules
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| Hair Embryology | Begins = Week 14
Direction of hair shaft = 15-19 weeks
Lanug0 = 20 weeks to birth
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| Landmarks of the Hair | Distribution, Whorls, Color, Eyebrows, Pubic/axillary hair
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| Minor anomalies of the Hair | Low anterior hairline, Widow's peak, Supernumerary whorls.
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| Synophrys | Cornelia De Lange
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| Embryology of the Nails | Fingers separate and nails begin = Week 10
Nails to fingertip = 32-33 weeks
Toenails lage behind.
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| Landmarks of the Nails | Shape, Lunula, Cuticle, Curvature, Nail angle
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| Nail abnormalities | Thickened nails, Dystrophic nails
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| Malformations of the Nail | Narrow, Hyperconvex, Tapered, Broad, Small, Aplastic.
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