Term
| Name one type of epithelia each germ layer gives rise to |
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Definition
1. Ectoderm - Epidermis
2. Mesoderm - lining of the kidneys, uterus
3. Endoderm - lining of the gut |
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Term
| What 2 structures do Neural crest cells transform into |
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Definition
1. Peripheral nervous system
2. Adrenal medullary cells |
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Term
| What 2 major parts of the body does the embryonic ectoderm give rise to |
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Definition
1. Neural tube (eventually becomes nervous system)
2. Outer epithelium of the body |
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Term
| What are melanocytes and where do they come from |
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Definition
| Pigment producing cells and they come from the neural crest |
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Term
| What are Langerhan's cells and where do they come from |
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Definition
| Antigen presenting skin cells that are made in bone marrow |
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Term
| What are the 2 major steps in the formation of epidermal appendages |
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Definition
1. Downgrowth of the epidermis into the dermis
2. Induction of dermis cells by epidermal signals |
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Term
| 4 major causes for ectodermal dysplasias are mutatations involved in: |
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Definition
1. Cell-cell communication
2. Adhesion
3. Transcription regulation
4. "Other" functions (i.e. a DNA helicase) |
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Term
| Describe the inductive processes that govern the transformation of the ectoderm and mesoderm into the epidermis and dermis |
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Definition
1. The ectoderm induces the mesoderm to differentiate into the dermis
2. The dermis then in turn induces the ectoderm to differentiate into the epidermis.
3. Region of body that the dermis is taken from governs the differentiation of the epidermis (dermis from the sole leads to thick epidermis, dermis from top of head leads to hair follicle formation) |
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Term
| From what part of the ectoderm does the inducing signal in teeth formation come from? |
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Definition
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Term
| What cells give rise to enamel? |
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Definition
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Term
| What cells give rise to dentin? |
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Definition
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