(6) Integument
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39 terms
Terms | Definitions |
|---|---|
 T/F skin is the largest organ | T |
| T/F hypodermis is not actually part of the "skin" | T (just fat underneath) |
| Embryology of 3 layers | epidermis: from ectoderm hypodermis and dermis: from mesoderm |
| melanocytes develop from which embryonic layer | ectoderm (like epidermis) |
| 4 major cells in the skin | keratinocytes melanocytes tactile epithelial (Merkel discs) dendritic cells |
| most common cell type in skin | keratinocytes (keratin=protection, in all epidermis layers) |
| what are dendritic cells? | macrophage-like (in stratum spinosum) |
| merkel discs are in which layer | stratum basale |
| melanocytes: fxn and layer | make/secrete pigments stratum basale (w/ merkel discs) |
| T/F stratum basale has cells that continuously undergo mitosis | T |
| what happens to keratinocytes as they move "up" the epidermis | cytoplasms fill with keratin (that they make!) |
| describe a keratinocyte at the end of it's life | dead, flat sac of keratin in the stratum corneum |
| how long does it take Henna to shed? | get entirely new skin about every month (a liittle longer) |
| what's a callus | thickening of epidermis due to ^ friction |
| T/F keratin is an extracellular protein for skin protection | F (fills cytoplasm) |
| which layer is only in thick skin? | lucidum |
| why dermal papillae? | b/c epidermis nonvascular, but needs nutrients to keep basale alive and dividing |
| T/F stratum basale is the thinnest layer in the epidermis | T (nearly single row of cells) |
| what are the "spider shaped" cells of the epidermis | melanocytes; lanky processes give melanin to keratinocytes |
| why does light complexion=freckles? | light complexing=low melanin (blocks UV), so UV penetrates better to basale, where freckles are made |
| problem with suntans? | ^sunlight=^melanin=blocks UV=no more vit D! |
| what's Vit D do? | takes Ca from food = strong bones |
| albinism? | lack enzyme to make melanin |
| 2 other skin pigments? | carotene (from carrots, can accumulate in corneum) hemoglobin (if too low melanin, you can see blood) |
| what IS a freckle? mole? | clumps of melanin |
| why does a mole form? | clusters of melanocytes fail |
| cancerous mole types? (from least to most serious) | (least) basal cell carcinoma squamous cell carcinoma (most) melanoma |
| where are dendritic cells found? | stratum spinosum |
| what's the "clear layer" in the skin | lucidum (thick only) |
| "leather" of the skin? | dermis |
| what/where are the 2 nerve plexes of the dermis? | pacinian (deep=reticular layer) meissner's (papillary) |
| fiber type of the dermal layers? | papillary = areolar CT (loose CT) reticular = dense irregular CT |
| T/F fingerprints and flexure lines are a result of stuff in the dermis, rather than the epidermis | T |
| varying density of collagen causes... | cleavage/tension lines, in reticular dermis |
| where does it go where you eat hella Chipotle | hypodermis |
| rule of 9s? | estimate |
| glands next to hair? | sebaceous |
| what secrete true sweat? | eccrine |
| what determines hair type | shape of C.S |
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