Posts Tagged 'modern humans'

Diploic growth

After our first survey on diploic channels in humans, here a second one on their growth and development. We have analyzed the ontogenetic variation in their length, lumen size and volume, in the frontal, parietal and occipital bones, and their correlation with skull size and bone thickness. Interestingly, there is a gradual increase of the vascular complexity, but a noticeable and outstanding spurt only in the adult stage. The development of these vessels is probably constrained by the thickness of the cancellous bone, and that’s why only in the adult stage we can observe a marked increase of their network complexity, as well as a marked increase of the individual diversity. If these vessels are involved in the thermal regulation of the endocranial cavity, their role is not patent until adulthood, at least if we consider their largest branches. Studies on the smaller ones are in course. It is worth noting that a large and complex diploic network is only observed in Homo sapiens, and not in living apes or extinct hominids. This may suggest some recent evolutionary adaptations. Here another post with more details.

Here a couple of recent reviews on craniovascular traits and anthropology and on craniovascular traits and human evolution. One paper specifically on the parietal bone, and a large survey of the prevalence of these features in modern populations.

Maludong

The pattern of modern human settlement in East Asia is still largely debated, mostly because of the scarce fossil record. Now we have two more specimens from southwest China, at the transition between Pleistocene and Holocene: Longlin and Maludong. Darren Curnoe and colleagues provide a general morphological analysis of the fossil remains. They reconstruct the endocast of Maludong 1704, giving information on the fronto-parietal proportions. The estimated cranial capacity is 1327 cc.


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RSS Cognitive archaeology

  • Oldest Human Footprints
    Klint Janulis, UCCS alum and on the Center for Cognitive Archaeology board of directors, was recently on the team that uncovered Saudi footprints believed to be the oldest found on the Arabian peninsula. Read their scientific journal article here: https://advances.sciencemag.org/content/6/38/eaba8940 Other news stories about this discovery:Yahoo News: https: […]

RSS The Skull Box

  • Homo erectus temporal lobes
    This week, we provide a new study of temporal lobe evolution in the Homo erectus hypodigm inferred from the middle cranial fossa (MCF) of the skull. Following from our earlier publication this year where we determined a strong reliability for MCF metrics to predict the temporal lobe volume of the brain in extant anthropoids and […]

RSS Anthropology

  • The Genetics of the Transatlantic Slave Trade
    Between the 16th and 19th centuries, approximately 12.5 million people were violently deported from their homes in Africa to the Americas by slavers. As current events have shown, the destruction of communities, cultures and families have had everlasting ramifications which are felt a century and half later. Some of the less tangible pains is the... Continue […]

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RSS Neurophilosophy

  • Researchers develop non-invasive deep brain stimulation method
    Researchers at MIT have developed a new method of electrically stimulating deep brain tissues without opening the skullSince 1997, more than 100,000 Parkinson’s Disease patients have been treated with deep brain stimulation (DBS), a surgical technique that involves the implantation of ultra-thin wire electrodes. The implanted device, sometimes referred to as […]

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