1 / 10

SKIN/TATTOOS

SKIN/TATTOOS. Justin Tomes. SKIN. Protection – covers arteries/veins, bones, muscles, organs, etc. - against pathogens Insulation – regulate temperature Perhipheral nervous system Somatosensation – “touch” Hair (or lack of) Nails Hydration Synthesizes Vit D and defensive proteins.

amil
Download Presentation

SKIN/TATTOOS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SKIN/TATTOOS Justin Tomes

  2. SKIN • Protection – covers arteries/veins,bones, muscles, organs, etc.- against pathogens • Insulation – regulate temperature • Perhipheral nervous system • Somatosensation – “touch” • Hair (or lack of) • Nails • Hydration • Synthesizes Vit D and defensive proteins • Variety of shades and hues-response to UV radiation-ethnicity • Gradients in color and thickness-textures (callus versus “baby’s bottom” versus scarring)-skin layers and cells as inspiration/sources for art • Canvas for expression -tattoos, piercings, implants • Aging effects-decrease in hydration-more elastic-balding, graying

  3. SKIN • DERMAL LAYERS- EPIDERMIS -Different strata (layers) -Replicate via mitosis in the bottom layer (strata basale) and daughter cells move up to a higher strata -during this process the cells differentiate and become highly organized

  4. SKIN • DERMAL LAYERS-DERMIS-made up of connective tissues-provides strength and elasticity-location of mechano receptors (nerve endings; somatosensation)-location of hair follicles, sebaceous and apocrine glands, blood and lymphatic vessels

  5. SKIN • BODY ECOLOGY-secretes fatty acids that kill pathogenic bacteria, viruses, and fungi • Harsh chemicals and synthetic soaps may wash away those acids • Affected by seasons-dry in winter, more acne during seasonal fast (purging toxins)

  6. SKIN/TATTOOS • Canvas for expressing opinions and beliefs-Style- traditional, trash polka, abstract, watercolor, etc. • Display social status, family history-Maori and Polynesian -Yakuza • Sexual selection (do you prefer a member of the opposite gender to have tattoos?). Social acceptance/recognition. • Skin grafts (containing tattoos) from famous people or tattoo artists- like a “framed original”)

  7. SKIN • SOMATOSENSORY STRIP (s1) • Strip of the cortex that stretches from ear to ear • Sectioned off into every part of the body • Areas with more receptors (hands) have more “real estate” • If an area of this is damaged sensitivity is decreased in the corresponding surface

  8. SKIN • Receptors (mechano, thermo, nociceptors) are modified nerve endings of sensory neurons with axons that run directly to the spinal cord • Spinal cord contains a dorsal column track (transduction: convert stimuli into sensory impulses) • Neurons detect internal and external changes in the environment -convert the energy of the sensation into electrical signals -signals are received in the brain

  9. SKIN • Skin is perceived (eyes)-optic nerve-optic track that wraps around the middle of the brain to get to the lateral geniculate nucleus (LGN)-axons “fan out” through deep white matter (coordinates communication within brain).-Radiates into the primary visual cortex (v1) (pattern recognition).

  10. SKIN • We may associate patterns with specific “types” of people- Biased against/for tattooed population- Ethnicity • Signals about health-age (wrinkles)-cancer (melanocytes)-sickness (pale skin)

More Related