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Thread: Differences of the Chin and Jaw between Races

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    Differences of the Chin and Jaw between Races

    I read different things about that issue, but just some thoughts, maybe others can explain it better of have more data to speak about it.

    In general I see two reasons for a stronger chin in Europids than in paedomorphic or archemorphic races.

    First is sexual selection, maybe the more important, 2nd might be a "structural reason" because the strong orthognathy and reduced teeth area had to be "redesigned".

    But ok, I'm not really an expert on the that subject, so comments are welcomed.

    First there are two reasons for a small, negative (receding) chin.

    First reason is archemorphy = primitive morphology like you can find it in Australids in extreme, but are most features in Negrids as well.

    There seems to be a different and not as developed evolution in general, especially if its about sexual selection.
    The bones of the skull are quite strong and prognathy is obvious.

    The 2nd reason for a small chin (but usually not fully receding) is Paedomorphy, like it is common in most Mongolids.
    Its basically good explained by what I have written about Paedomorphy vs. Progressive races.

    Such types are not as sexually selected (especially males), are less masculine and more reduced.

    Europeans on the other hand seem to be quite strongly selected for sexual advantageous features, are more masculine than most Mongolids (maybe with the exception of Nordsinids).

    If you "woud push the prognathous" underface back, it would look strange and weak, especially if the nose would still stood out. ("Vogelprofil" ~ "profile like a bird" - typical for very Asthenic Europids)

    This looks somewhat odd, and not very masculine. So the relocated underface and bone reduction which occurs in progressive races in general (even in all mammals) had to be balanced, by a still "masculine-strong-looking-feature" which combined "new"-neomorphic features with strong-masculine ones.

    Furthermore because of the general reduction of underface, teeth and mandibles, the whole underface bone structure was weaker.
    I'm not sure about that, but some said that a "stronger and thicker" point - chin could be an adaption to make the weaker bones more stable, stronger - like a bumper. ^^ (a theory I read with others)

    But what we know is that strong jaws+chin is a masculine signal, and therefore if there is strong sexual selection + advantage of neotonic - general progressive and orthognatic individuals, we can assume that a strong chin-jaw as a signal of strength. Especially for orthognatic individuals (males) this could have been very advantageous.

    If you look at old and very robust races/species like the Homo neanderthalensis - he had no chin.

    Of course for him both would be true - needed no bumper because his jaw was very strong and masculine features were in general quite strong.

    Whereas typically progressive for modern humans is imo THE COMBINATION of finer features, bigger brain case, less extreme masculinity and reduced coarse features (= roughly Paedomorphy) WITH CERTAIN masculine features and general robustness - a balanced type with all advantages not just one: like specialization of being subdominant and child-like OR aggressive and coarse, but balancing both on a higher level, still able to develop further without losing physical strength and attractiveness or mental capability.
    Last edited by Agrippa; Tuesday, June 22nd, 2004 at 04:59 PM.
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    Post Re: Differences of the chin and jaw between races-individuals

    For the idea that prognathy and a receding chin was sexually selected, especially when the teeth area was reduced and pushed for other reasons under the upper face, I provide some pictures:



    Its the same person before and after a surgery.

    Of course an extreme chin and retrognathy is unattractive as well, especially in women. Such a combination seems to be more common in extreme Dinarids:



    For the idea that the chin also could make the jaw more stable if the whole area is reduced a picture of the jaw and its structure:

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