Scientists from the U.S. found out why owls can turn its head 270 °

Experts from Johns Hopkins University in Baltimore examined how birds of prey can almost turn my head in any direction. It was found that the blood vessels of the cervical spine has special tanks that fill with blood when you turn and continue to nourish the brain.
Owls tend to actively turn his head while hunting. To find out how they manage to done it without damaging the neck and brain, the team examined the bones and structure of blood vessels in the head and neck of several species of owls after they died of natural causes, according to NDTV.
"Until now, experts in the brain, dealing with injuries caused by the damage of the arteries of the head and neck, were puzzled why fast and twisting movements of the head do not make thousands of owls drop dead of a stroke," — says the study's lead author, Philip Gallo neuroradiologist .
To improve the X-ray images of blood vessels birds used contrast agent. Scientists were amazed by the process that began with the introduction of the fluid into the artery, simulating blood. As more and more researchers injected substance, the blood vessels at the base of the head extended and continued to collect the "blood."
Such an effect is in sharp contrast to the anatomical attributes of man, whose artery in similar conditions are becoming narrower.
It is these vessels, the researchers said, the owls can meet the energy needs of the brain and the eye at the time, when they rotate head. That is, support for the vascular network helps to minimize any interruption of blood flow.
"The results of our new research shows what kind of morphological changes are needed to cope with such fluctuations in the head, and why people are so vulnerable to injury from osteopathic manipulation" — says Gallo.
The results will be published in February in the journal Science.
Category: Animals

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