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| What joins skin to underlying tissues such as muscle? |
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consists of several layers of squamous cells in four recognized layers from deep to superficial |
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| Columnar cells, rapid mitosis, the layer that provides the new cells, rests on basement membrane |
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| As cells move upward and outward, become flattened, cells contain granules of Keratin, a high molecular weight fibrous protein, cells dies and lose nucleus. |
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| Very flat cells, clear as the keratin granules become keratin fibrils |
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| Very flat cells, with much keratin, refererred to as cornified or horny. Potects body, water proofs and air proofs. These cells are gradually sloughed off and replaced from below. |
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| many factors. melanin produced by pigment cells called melanocytes, in germination layer of epidermis. |
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mesodermal embyonic origin mainly, this layer does contain blood vessels/ 2 layers |
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| wavy lines of small projections just under the epidermis, responsible for fingerprints |
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| Most of dermis, Mostly bundles of collagenous fibers, with blood vessels, nerves, glands, hair follicles. |
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Term
2 Types of Skin glands: where do they originate? |
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Definition
All originate originally in ectoderm, but migrate into the dermis layer 1. Sweat glands: most are merocrine, all have a duct leading up through the epidermis 2. Sebaceous Glands: holocrine in type, secrete oily substance. Most of the ducts empty into hair shafts, but some empty on the skin surface. Prevents drying of the skin and hair. |
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each hair consists mainly of a shaft of keratinixed cells compacted together. Each hair originates from a hair follicle which begins its decelopment in the epidermis, then grows down to take up residence in the dermis with the hair shaft projection up through the epidermis to the outside. --each hair follicle is attached to an arrector pili muscle. makes hair stand up. |
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| Outgrowth of the epidermis, heavily cornified. Lots of keratin. |
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