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22 Cards in this Set
- Front
- Back
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name layer below epithelium/basement membrane
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basement membrane, superficial to desnse irregular connective tissue
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basic energy reaction
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fule + oxygen ---> ATP + corbon dioxide + water
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Whta process is involved for stuff to get through to the epithelium?
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diffusion
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which embryonic germ layer gives rise to 4 primary tissue types
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embryonic - includes endoderm, mesoderm & ectoderm
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Papillary region of ?
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top 1/5 = Papilllary
-the superfical portion = areolar connective tissue w/elastic fibers, contains: 1) dermal papillae that houses capillaries, 2) corpuslce of touch 3) free nerve endings |
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Reticular region of ?
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deepr portion (about 4/5) = Reticular
-= desne irregular connective tissues w/collagen bundles & some leastic fibvers; spaces in bewteen cotaint hari, nerves sebaceous glands, sudoriferous glands & fat cells |
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Dermis cells
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fibroblasts, macrophages & adipocytes
- blood vessels, nerves, glands & hair follicles are also embedded in dermal tissues |
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what structures are found inthe dermal papillae & their specific functions?
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1) dermal papillae that houses capillaries, 2) corpuslce of touch 3) free nerve endings
*dermal papillae grealy increase the surface area (small finger like projections), they indent the epidermis -in some you can find Meissner corpuslces (outouch), nerve endings taht are sensitive to touch, & free nerve endings |
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Stratum Spinosum
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= 8 ~ 10 rows of polysided
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Stratum Basale
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= deepest layer of epidermis
= 1 single row of cuboidal/columnar keratinocytes -***whegre stems cells undergo cell dvions to produce new keratonobyes,\-**8where melanocytes, Langehan clles 7 Merkel cesll associated with touch are sctattered among keratinoytes |
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Stratum Spinosum
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= 8 ~ 10 rows of polysided
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Stratum Basale
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= deepest layer of epidermis
= 1 single row of cuboidal/columnar keratinocytes -***whegre stems cells undergo cell dvions to produce new keratonobyes,\-**8where melanocytes, Langehan clles 7 Merkel cesll associated with touch are sctattered among keratinoytes |
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Stratum Granulosum
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= 3 - 5 rows flattened keratonicytes, organells beginning to degenrate, cells contiantin keratohyalin, converts tonofiliametns into keratin, lamellar granules, release a lip-rich water-repellent secretion
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Stratum Lucidum
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*** - present only in : fingertip, palsm & soles
- = 3 to 5 rows of clear, flat dead keratonocytes w/large amts of keratin |
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Stratum Corneium
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= 25- 30 rows of dead flattened keratinocytes
- continuously shed & replaced by cells from deeper strata -betwen cells are lipds from lamellar granules that help make this layer an effective water-repellent barrier -thsi is also where callus are formed!(contian mostly keratin) |
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what provides skin w/strenght, extensibility (stretchabiligy & elasticity)?
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collagen _ elastic fibers in the reticular region
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Langerhan cells
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= immune
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Merkell cell
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sensory & tactile
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6 functions of skin
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1. regulates boyd temp
2. protects from extl environ 3. excretes & absobs 4. helps w/vit D synthesis 5. provides sensation 6. cutaneous sensation |
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subcutanesou (subQ) layer aka
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hyupodermis
= areolar & adipose -has fat & blood vessels -also has lamellated (Pacinian) corposuscles) that are senstiive to pressure (deep pressure!) |
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What is epidermis made of? (1 million $ quesitons)
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keratinized stratified squamous epithelium
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what 4 cells does it contsist of ?
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LM
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