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30 Cards in this Set
- Front
- Back
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Skin and its accesory structures-hair, nails, along with various glands, muscles, and nerves?
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Integumentary System
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Covers the external surface of the body, is the largest organ of the body (in both surface area & weight)?
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Skin or cutaneous membrane
-22 sq. ft. -10-11 lb. |
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The superficial, thinner portion of the skin composed of epithelial tissue is the?
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epidermis
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The deeper, thicker connective tissue part is the?
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dermis
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Deep to the dermis, but not part of the skin, is what layer?
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subcutaneous layer (subQ)
-AKA: hypodermis |
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What layer consists of fascia, adipose tissue and blood vessels?
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hypodermis
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Composed of keratinized stratified squamous epithelium?
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Epidermis
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What are the four types of cells found in the epidermis?
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1.keratinocytes
2.melanocytes 3.Langerhans cells 4.Merkel cells (disc.) |
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Arranged in 4 or 5 layers and produce the protein keratin?
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keratinocytes
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Develop from the ectoderm of a developing embryo & produce the pigment melanin?
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melanocytes
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A yellow-red or brown-black pigment that contributes to skin color & absorbs damaging UV light?
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melanin
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Arise from red blood marrow & migrate to epidermis, & participate in immune responses?
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Langerhans cells
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Cells thought to function in the sensation of touch?
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Merkel cells (disc.)
-located in deepest layer of epidermis. |
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The layer of the epidermis that contains stem cells undergoing mitosis is the?
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Stratum basale
-stratum germinativum |
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Which layer of the epidermis contains ALL the types of cells?
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Stratum basale
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Thorny connective layer superficial to stratum basale?
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Stratum spinosum
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Layer where keratinocytes move upward and die?
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Stratum granulosum
-"graveyard" layer |
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Layer present ONLY in the thick skin of the fingertips, palms, and sole?
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Stratum lucidum
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The layer of skin you seen when looking at someone, contains dead keratinocytes?
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stratum corneum
-subject to alot of wear & tear. |
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Process that takes keratinocytes to migrate from basale layer to granulosum layer and die is called?
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keratinization
-takes about 4 wks. |
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Composed mainly of connective tissue?
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Dermis
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What are the two regions that make up the dermis?
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1.Papillary region
2.reticular region |
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Makes up about 1/5 of the thickness of the total dermis layer?
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Papillary region
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Found in the papillary region, fingerlike structures called?
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dermal papillae
-which contain Meissner corpuscles (corpuscles of touch) |
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Deepest layer of the dermis; contains, hair follicles, glands and adipose tissue?
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reticular region
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Fingerprints or footprints are also called?
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epidermal ridges
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Produce a pigment that contributes to skin color and absorbs ultraviolet light?
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melanocytes
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A round flat-raised area that represents a benign localized overgrowth of melanocytes & usually devlops in childhood or adolescence?
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Nevus, or mole
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Melanocytes need what enzyme present to activate colorization?
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tyrosinase
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The oxygen-carrying pigment in red blood cells?
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hemoglobin
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