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I do not know biology, but I notice that human skull have a particular form that is like a upward spike and other skulls which are only oval.

upward spike:

enter image description here

oval:

enter image description here I know that in the example images the first skull is more big than the second skull but, imagine if both skulls have the equal size.

But the first type skull, go up, I mean first the forehead is a little inclined and then rises to the top of the head making the front of the skull smaller than the rest of the head.

While the oval skull is of equal size both, in front of the skull and the rest of the head.

My question is whether this is relevant to brain size or brain capacity? I mean people who have the first skull has a slightly smaller brain than people who have an oval skull or if it does not matter the shape of the skull and people can have the brain of the same size no matter what type of skull they have.

Besides that if because the first skull has that form, somehow affects the performance of the brain, since good part of the skull is smaller than the other and not in equal size like the oval skull and because of that the brain has a bit of complication.

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  • $\begingroup$ With the last part I would like to share an image to show what I mean: imgur.com/gallery/NbvKrQi $\endgroup$ – halohalo lalalo Aug 12 '17 at 15:19
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    $\begingroup$ The kinds of subtle differences you use in your examples wouldn't cause changes in brain growth. That being said, there are more extreme cases of skull deformations that occur at infant stages, of which could possibly alter brain size/volume. Studies are currently being done to explore this. But the minor differences you speak of and illustrate - no, those would not cause a change in brain size. $\endgroup$ – Charles Aug 12 '17 at 16:03
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    $\begingroup$ "Brain volume did not distinguish cases and controls (p=.214–.976)." ncbi.nlm.nih.gov/pmc/articles/PMC3393042 $\endgroup$ – Charles Aug 12 '17 at 16:05

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