On Sat, 14 Oct 2023 06:22:59 -0700 (PDT), "littor...@gmail.com"
Frontal sinuses and human evolution
Antoine Balzeau cs 2022 Science Advances 8, Issue 42
doi 10.1126/sciadv.abp9767
The frontal sinuses are cavities inside the frontal bone, located at the junction between the face & the cranial vault, close to the brain.
Despite a long history of study, understanding of their origin & variation through evolution is limited.(?? :-) --mv)
This work compares most hominin spp’ holotypes & other key individuals with extant hominids.
It provides a unique & valuable perspective of the variation in sinuses position, shape & dimensions, based on a simple & reproducible methodology.
We also observed a co-variation between sinus size+shape & the underlying frontal lobes in hominin spp, from at least the appearance of H.erectus.
Our results additionally undermine hypotheses stating that hominin frontal sinuses were directly affected by bio-mechanical constraints resulting from chewing, or adaptation to climate.
Last, we demonstrate their substantial potential for discussions of the evolutionary relationships between hominin spp.
Yes, the paranasal sinuses (frontal, maxillary, ethmoidal...) had nothing to with chewing, nor climate, nor brain function.
- H.erectus had small PNSs.
From the paper:
"Both H. erectus s.l. and H. sapiens show relatively great variation
in the size and shape of the frontal sinuses (table S4),
Frontal sinuses and human evolution
Antoine Balzeau cs 2022
Science Advances 8, Issue 42
doi 10.1126/sciadv.abp9767
The frontal sinuses are cavities inside the frontal bone, located at the junction between the face & the cranial vault, close to the brain.
Despite a long history of study, understanding of their origin & variation through evolution is limited.(?? :-) --mv)
This work compares most hominin spp’ holotypes & other key individuals with extant hominids.
It provides a unique & valuable perspective of the variation in sinuses position, shape & dimensions, based on a simple & reproducible methodology.
We also observed a co-variation between sinus size+shape & the underlying frontal lobes in hominin spp, from at least the appearance of H.erectus.
Our results additionally undermine hypotheses stating that hominin frontal sinuses were directly affected by bio-mechanical constraints resulting from chewing, or adaptation to climate.
Last, we demonstrate their substantial potential for discussions of the evolutionary relationships between hominin spp.
___
Yes, the paranasal sinuses (frontal, maxillary, ethmoidal...) had nothing to with chewing, nor climate, nor brain function.
- H.erectus had small PNSs.
- H.neand. & heidelb. had large PNSs.
Op zondag 15 oktober 2023 om 17:31:12 UTC+2 schreef Pandora:
On Sat, 14 Oct 2023 06:22:59 -0700 (PDT), "littor...@gmail.com"
Frontal sinuses and human evolution
Antoine Balzeau cs 2022 Science Advances 8, Issue 42
doi 10.1126/sciadv.abp9767
The frontal sinuses are cavities inside the frontal bone, located at the junction between the face & the cranial vault, close to the brain.
Despite a long history of study, understanding of their origin & variation through evolution is limited.(?? :-) --mv)
This work compares most hominin spp’ holotypes & other key individuals with extant hominids.
It provides a unique & valuable perspective of the variation in sinuses position, shape & dimensions, based on a simple & reproducible methodology.
We also observed a co-variation between sinus size+shape & the underlying frontal lobes in hominin spp, from at least the appearance of H.erectus.
Our results additionally undermine hypotheses stating that hominin frontal sinuses were directly affected by bio-mechanical constraints resulting from chewing, or adaptation to climate.
Last, we demonstrate their substantial potential for discussions of the evolutionary relationships between hominin spp.
Yes, the paranasal sinuses (frontal, maxillary, ethmoidal...) had nothing to with chewing, nor climate, nor brain function.
- H.erectus had small PNSs.
From the paper:
"Both H. erectus s.l. and H. sapiens show relatively great variation
in the size and shape of the frontal sinuses (table S4),
Yes, my little boy: as you might know (???), sea-water is heavier than fresh-water:
H.erectus Java had small PNSs, H.heidelb.-neand. has large PNSs:
He<Hs<Hn.
Okidoki?
Hn probably seasoanlly followed the Rhine+Meuse... inland. Salmon trek??
In Hs, PNSs are only(?) the cause of sinusitis...
Op zondag 15 oktober 2023 om 17:31:12 UTC+2 schreef Pandora:
On Sat, 14 Oct 2023 06:22:59 -0700 (PDT), "littor...@gmail.com"
Frontal sinuses and human evolution
Antoine Balzeau cs 2022 Science Advances 8, Issue 42
doi 10.1126/sciadv.abp9767
The frontal sinuses are cavities inside the frontal bone, located at the junction between the face & the cranial vault, close to the brain.
Despite a long history of study, understanding of their origin & variation through evolution is limited.(?? :-) --mv)
This work compares most hominin spp’ holotypes & other key individuals with extant hominids.
It provides a unique & valuable perspective of the variation in sinuses position, shape & dimensions, based on a simple & reproducible methodology.
We also observed a co-variation between sinus size+shape & the underlying frontal lobes in hominin spp, from at least the appearance of H.erectus.
Our results additionally undermine hypotheses stating that hominin frontal sinuses were directly affected by bio-mechanical constraints resulting from chewing, or adaptation to climate.
Last, we demonstrate their substantial potential for discussions of the evolutionary relationships between hominin spp.
Yes, the paranasal sinuses (frontal, maxillary, ethmoidal...) had nothing to with chewing, nor climate, nor brain function.
- H.erectus had small PNSs.
From the paper:
"Both H. erectus s.l. and H. sapiens show relatively great variation
in the size and shape of the frontal sinuses (table S4),
Yes, my little boy: as you might know (???), sea-water is heavier than fresh-water:
H.erectus Java had small PNSs, H.heidelb.-neand. has large PNSs:
He<Hs<Hn.
Frontal sinuses and human evolution
Antoine Balzeau cs 2022 Science Advances 8, Issue 42
doi 10.1126/sciadv.abp9767
The frontal sinuses are cavities inside the frontal bone, located at the junction between the face & the cranial vault, close to the brain.
Despite a long history of study, understanding of their origin & variation through evolution is limited.(?? :-) --mv)
This work compares most hominin spp’ holotypes & other key individuals with extant hominids.
It provides a unique & valuable perspective of the variation in sinuses position, shape & dimensions, based on a simple & reproducible methodology.
We also observed a co-variation between sinus size+shape & the underlying frontal lobes in hominin spp, from at least the appearance of H.erectus.
Our results additionally undermine hypotheses stating that hominin frontal sinuses were directly affected by bio-mechanical constraints resulting from chewing, or adaptation to climate.
Last, we demonstrate their substantial potential for discussions of the evolutionary relationships between hominin spp.
Yes, the paranasal sinuses (frontal, maxillary, ethmoidal...) had nothing to with chewing, nor climate, nor brain function.
- H.erectus had small PNSs.
From the paper:
"Both H. erectus s.l. and H. sapiens show relatively great variation
in the size and shape of the frontal sinuses (table S4),
Yes, my little boy: as you might know (???), sea-water is heavier than fresh-water:There is no mention of water (salt or fresh) in the paper,
H.erectus Java had small PNSs, H.heidelb.-neand. has large PNSs:
He<Hs<Hn. Okidoki?
Hn probably seasoanlly followed the Rhine+Meuse... inland. Salmon trek?? In Hs, PNSs are only(?) the cause of sinusitis...
therefore it is not relevant.
Further https://www.learnz.org.nz/argofloats142/bg-standard-f/ocean-salinity-and-temperature
Density = mass/volume. Increasing the mass by adding salt increases the density.
density of fresh water is 1gm/ml
density of sea water is 1.025 gm/ml
Seawater is a little bit more dense than fresh water so
it sinks beneath freshwater. This means that when rivers
flow out into the sea the river freshwater floats on top
of the sea water. However when the wind blows and the sea
becomes rough, the two waters get all mixed up.
A difference of only .025 gm/ml...
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