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Re: [HAPS-L] Skin--never leave home without it!
Robert and others
Robert, I like your line up of topics.
I am wondering if anyone teaches the skin as an organ of elimination?
Debby
----- Original Message -----
From: "Rawding, Robert S" <RAWDING001@xxxxxxxxxx>
To: <HAPS-L@xxxxxxxxxxx>
Sent: Tuesday, March 20, 2007 2:05 PM
Subject: RE: [HAPS-L] Skin--never leave home without it!
HAPSters,
I spend 2 lectures on the skin and I devote a lab to its anatomy with
models and microscope slides, then examining skin sensor function (from
the Marieb lab manual).
These are the lecture topics I cover, with about 55 PowerPoint slides:
-Skin factoids (surface area, etc.)
- Functions
- Anatomy - dermis, epidermis, (hypodermis); layers; nerve endings;
blood vessels; sweat glands, apocrine glands, etc.
- Several H&E micrographs with structures all identified
- Melanocytes, Langerhans cells
- Thin vs thick skin; goose bumps, perspiration & reflexes
- Superficial and deep sensors
- Dermal ridges & fingerprints
- Sex differences in deposition of subcutaneous fat
- Collagen types/ Langer lines / striae / cellulite
- Lack of scarring from in utero surgery
- Hair types & distributions (lanugo, vellus, terminal)
- Hair structure and growth cycles
- Hair color and texture
- Fingernail structure and physiology (zinc deficiency = white spots on
nails, for example)
- Skin disorders overview (not all 1,400 or so of them!), including
wheals, macules, nodules, etc.
- Sources of infections (bacterial / viral /fungal / etc)
- Types of skin wounds / treatments & wound healing
- Embryonic hair and gland development
- Degrees of skin burns and the Rule of 9's; treatments
- Skin cancers
- Miscellaneous (rosacea, port wine stains, comedos, etc.)
- Tattoos and pigment removal
Bob
-----Original Message-----
From: HAPS-L-owner@xxxxxxxxxxx [mailto:HAPS-L-owner@xxxxxxxxxxx] On
Behalf Of David Evans
Sent: Tuesday, March 20, 2007 10:56 AM
To: HAPS-L@xxxxxxxxxxx
Subject: RE: [HAPS-L] Skin--never leave home without it!
The integument is the most neglected organ system, compared to its
importance, in anatomy and physiology.
-----Original Message-----
From: HAPS-L-owner@xxxxxxxxxxx [mailto:HAPS-L-owner@xxxxxxxxxxx] On
Behalf Of Terry Meehan
Sent: Monday, March 19, 2007 9:40 PM
To: HAPS-L@xxxxxxxxxxx
Subject: Re: [HAPS-L] Skin--never leave home without it!
Why skin is dark to light: UV exposure; lower UV results in selection
for lighter skin so enough UV reaches the cells to make vitamin D & vit
D is needed for.... [ Over the last couple of decades anthropologists
have made a good case with lots of evidence for skin darkness being
dependent on latitude, adjusting for env. where there's lots of UV/glare
despite latitude (snow, ice, sea, high altitude), and of course, recent
migrations mixing it all up (at least the last several thousand years).
]
Why are skin is "naked." Typical human skin has the same density of
hairs as a chimp (our living sister species), but our pelage is finer &
shorter.
Major hair reduction can almost for sure be predicted to have occurred
at the onset of the genus Homo (2.4 mya), when the brain greatly
enlarged--nervous tissue is very heat sensitive, and we need to cool our
fat head; humans pay a great price for such an elaborate cooling
system--in salt & water. [ It would be nice if human kidneys were much
better at conserving water. #@!$$ ] As we sweated more to cool a bigger
& bigger brain, can't have insulating hair--it hinders evaporative
cooling--imagine trying to sweat through mom's fur coat. Concomitantly
our hyopdermis is unusually thick all over--odd for a terrestrial
mammal--it's compensating insulation for loss of fur coat. [ I never
thought the "aquatic" ape hypothesis held any water. ]
There are other neato things about human skin, including communicative,
sexual, & paedomorphic traits, but it's now dinner time, and then a
shave to look younger & sexier. Although, for me, by this decade, I
think it's too late for that...@#!$$%% Terry
PS You could also go medical--things done to heal it, etc. to show its
importance or even the purely cosmetic stuff.
Here's my 201 skin ad:
Few organs are as accessible, large, varied in function, & as
underappreciated. Your integument accounts for about 7% of your total
body weight (11lbs for a 155lb person), making it the largest organ of
the body (the liver comes in 2nd). It's about 20 square feet in surface
area and varies in thickness from 0.2mm-5mm. It's continuously abused,
abraded, attacked by microorganisms, irradiated by sunlight, & exposed
to chemicals. On average, one sheds 30lbs of epidermis in a lifetime
and you get a new "coat" every 35-45 days. Of all the systems, the
integument is the only one you see every day. It's more comfortable &
durable than Lt.
Columbo's trench coat. The integument is highly water resistant,
stretchable, washable, perma-press, self-repairable, lasts a "lifetime,"
and its natural hair & tone colors always match, and for the more
fashionably conscious, matches your clothes too.
Why I could talk about human skin adaptations all night...but I am a
diurnal primate...ha ha...
--- Teri Trendler <tatrendler@xxxxxxxxxxxx> wrote:
Hi all!
How appropriate that as we draw near to Sunny "Sandy Eggo" I have a
school wide "theme" that will be on display there and I'd like your
creative help with.
"The Pasadena Arts Council is pleased to announce the organization of
Art & Ideas, a festival of the arts, sciences, and humanities in
Pasadena and surrounding communities. The theme for Art & Ideas '07
is "Skin".
So as an A&P faculty member I've been asked what my division would
offer for the above topic. My reply was if we want to really get
"kids" interested we talk about piercings and tattoos...even have them
demo'd. What I'm wondering is do any of you have ideas I can steal?
lol I'd love to show those close-ups of the "bugs" that live on us
for shock value but what else?
Thanks!
Teri
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