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30 Cards in this Set
- Front
- Back
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What does the skin develop from?
-Epidermis -Dermis |
Epidermis = ectoderm
Dermis = Mesoderm |
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What 2 layers does the ectoderm give rise to?
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-Periderm
-Basal |
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Where do new skin cells always come from?
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Basal layer of ectoderm - then migrate superficially.
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What is the one important layer of the Basal epidermis that is important to remember?
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Stratum germinativum
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What gives skin its pigmentation? What tissue type?
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Melanocytes - neural crest cells migrated into st. germinativum.
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What is NOT in thick skin?
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Hair follicles
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What do all glands develop from?
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Downgrowth of the stratum germinativum
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2 types of sweat glands:
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-Eccrine
-Apocrine |
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Where are eccrine glands?
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In thick and thin skin
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Where are apocrine glands?
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In hair follicles, after puberty only.
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Where are are Sebaceous sweat glands?
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in hair follicles - but they don't secrete sweat; rather, SEBUM to protect.
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How do Hair follicles develop?
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Like sweat glands - downgrowth of ectoderm into the dermis.
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3 types of Hair follicles:
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1. Lanugo
2. Coarser 3. Terminal |
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When are lanugo hairs made?
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In utero and in anorexia nervosa
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When is coarsar hair made?
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It is permanent
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When does terminal hair develop?
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At puberty with apocrine glands
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What do nails develop from?
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Ectoderm
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What makes the cuticle?
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Eponychium - a skin covering over the nail.
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Ichthiosys
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Excessive keratinization resulting in lizard skin
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Albinism
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Lack of Melanin as a result of decreased Tyrosinase
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Allopecia
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hair loss
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Hypertrichosis
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Excessively hairy
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How do mammary glands develop?
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Like all the other glands.. Stratum germinativum ectoderm migrates down into basal mesoderm
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What embryonic tissue makes Teeth? (2 layers)
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Enamal = Oral Ectoderm
Dentin = Mesenchyme |
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What part of the tooth can't be regenerated?
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Enamal (dentin can)
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What cell type gives rise to enamal?
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Ameloblasts
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What cell type gives rise to Dentin?
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Odontoblasts
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What cell type gives rise to Cementum?
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Cementoblasts
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What cell type gives rise to the Periodontal ligament?
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Fibroblasts
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What embryonic tissue gives all cell types but enamal/ameloblasts?
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Neural crest from the Jaw
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