[HN Gopher] New muscle layer discovered on the jaw
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New muscle layer discovered on the jaw
Author : giuliomagnifico
Score : 89 points
Date : 2021-12-27 19:21 UTC (3 hours ago)
(HTM) web link (www.unibas.ch)
(TXT) w3m dump (www.unibas.ch)
| JimTheMan wrote:
| It's always astonishing to find that the envelope of cutting edge
| knowledge is sometimes far closer than you think.
|
| IE, jaw muscles hadn't been figured out yet.
| rbanffy wrote:
| That really doesn't help with my faith in medicine. It's not
| that doctors don't know a lot of things that work for a lot of
| conditions, but when it comes to knowing why something works,
| things get a lot murkier. I cut them a lot of slack because we
| evolved by chance and there is no design documentation or even
| clear requirements to work with.
| xiphias2 wrote:
| ,,That really doesn't help with my faith in medicine''
|
| Better knowledge of anatomy doesn't help medecine. Better
| knowledge of aging process and immunology is much more
| important for increasing human lifespan and decreasing human
| suffering, and the last 10 years gave us amazing improvements
| in the knowledge part.
| TedDoesntTalk wrote:
| > In a previous edition of Gray's Anatomy, from the year 1995,
| the editors also describe the masseter muscle as having three
| layers
|
| > Other individual studies from the early 2000s also reported
| three layers
|
| So not entirely new.
| [deleted]
| DantesKite wrote:
| Not entirely new, but apparently, not accepted by the medical
| community.
| DantesKite wrote:
| "The arrangement of the muscle fibers, she says, suggests that
| this layer is involved in the stabilization of the lower jaw. It
| also appears to be the only part of the masseter that can pull
| the lower jaw backwards - that is, toward the ear."
| trelane wrote:
| Seems a surprise that this has taken so long to be discovered,
| as every motion seems to require two muscles--one to pull and
| the other to relax/lengthen.
| PaulHoule wrote:
| It astonishes me how little help people can get for the very
| common TMD so I am not surprised to find anything is
| misunderstood about the functional anatomy of the jaw.
| Nuzzerino wrote:
| I've suffered since the age of 21, but the attacks are less
| frequent these days (I'm 35). I do not take any painkillers
| for it, even OTC. I have tried 6 or 7 "professionally-made"
| mouth guards, some of which cost thousands. None of them
| helped and would actually make it harder to sleep at night.
| I instead deal with it by using heat, massage (full body is
| key), exercise, and nutrition.
|
| For the record, I am also blown away by how incompetent the
| medical and dental professions are at treating this. Tap
| your teeth on a piece of paper? Puh-leeze, that does
| nothing when your joints or muscles shift at different
| times of the day, and maybe 1 in 5 dentists actually know
| how to properly account for that based on my experience
| dealing with them over the years. And swear to god, if I
| hear another licensed and credentialed dentist describe my
| joint hypermobility as "your jaw is weird", I'm going to
| shit a brick.
| AstroDogCatcher wrote:
| Yes. First experienced TMJ pain as a teenager and almost
| overdosed on painkillers while trying to get rid of it at
| 3AM. Still recurrs about 2-3 times per year, but I've now
| learned to feel it coming on much earlier and start loading
| up on codiene in advance.
| mkl95 wrote:
| I have been getting it 10+ times a year since my early
| 20s. Whenever it happens it's as terrifying as the very
| first time.
| [deleted]
| PaulHoule wrote:
| I had it a long time and was not sure the pain was
| localized in the jaw (was it the neck, shoulders, back?)
| or even the extent to which there was a physical lesion
| or it was how my brain was interpreting things.
|
| My dentist told me I was grinding my teeth and prescribed
| a bite guard and within two weeks the pain got better but
| became very definitely focalized in the jaw and I noticed
| 'popping' as a symptom.
|
| It has been about 1.5 years since the diagnosis. last
| summer I went through a phase of throwing a lot of random
| food into a pot and hitting it with an immersion blender,
| getting shakes from Burger King whenever I felt like it,
| etc. I lost almost 20 kg.
|
| I have been eating more normally since, it doesn't bother
| me very often.
| xhevahir wrote:
| What sort of bite guard did you use? I clench my teeth
| like there's no tomorrow and I've discovered over the
| years that any bite guard that doesn't completely cover
| every tooth (on either the lower or upper arch) will
| eventually result in a supra-eruption of the exposed
| tooth, with drastic consequences for my bite.
| jacobolus wrote:
| For other folks not familiar with these abbreviations, ht
| tps://en.wikipedia.org/wiki/Temporomandibular_joint_dysfu
| n...
| cjbgkagh wrote:
| AFAIK it's most likely a connective tissue disorder as
| opposed to muscular. For this there is also little help and
| rarely diagnosed. But at least may help find answers for
| comorbidities that are often considered unrelated.
| azinman2 wrote:
| I thought Botox helped?
| PaulHoule wrote:
| I'm sure it does but I am sure sham injections help too.
| amelius wrote:
| Yes. Found this personal blog:
|
| https://www.byrdie.com/botox-for-teeth-grinding
|
| and scientific review paper:
|
| https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5634354/
| yololol wrote:
| To me it seems a surprise that this has taken so long to be
| discovered in general. I thought we would know all muscles by
| now.
| Retric wrote:
| It's been known about for at least 25 years, but there was
| some debate about the specifics. Thus they "described this
| layer in detail for the first time."
| rbanffy wrote:
| It spent a good couple million years literally under our
| noses.
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