Blame that bad back on your ancestors

[mmglobal]

From: This Yahoo news story

Note the references to Dr. Aaron Filler... developer of MRN (Neurography).

Blame that bad back on your ancestors
By Maggie Fox, Health and Science Editor
Sun Jul 15, 12:05 AM ET

A spine specialist trying to figure out why people so often have bad backs says he has come up with a new theory about when and how early humans evolved the ability to walk upright.

The uncannily human-looking backbone of a 21 million-year-old precursor of humans and apes gives the first clue, said Dr. Aaron Filler of the Cedars Sinai Medical Center in Los Angeles.

A major change in the vertebrae that allowed this pre-human to stand upright and carry things also made it easier to crush and strain the spongy discs between each vertebra, Filler, a medical doctor with a doctorate in anthropology proposes.

That, in turn, explains why back pain is a leading cause of disability, he said.

Writing in the journal Neurosurgical Focus on Sunday, Filler said one main clue was a bone feature called the transverse process, which sticks out from the side of the hollow, round vertebrae, Filler said in a telephone interview. This is where muscles attach to the spine.

"The vertebra is transformed in a way that literally reverses the mechanics of the spine," Filler said. "The bone lever of the vertebrae gets switched from bending the spine forward to bending the spine back."

Most vertebrates are oriented forward, to walk on all fours. The transverse process is at the front of each vertebra, facing the animal's belly. This is true of monkeys, too.

But in humans and in the 21 million-year-old fossil of a creature called Morotopithecus bishopi, a tree-dwelling, ape-like creature that lived in what is now Uganda, the transverse process has moved backward, behind the opening for the spinal cord.

Great apes, such as chimpanzees, share this feature.

'THE UPRIGHT APE'

The fossil was discovered in the 1960s but no one noticed the important change until 1997, when paleontologist Laura MacLatchy of the State University of New York at Stony Brook reported on the remarkable features of Morotopithecus.

"That means that upright posture bipedalism goes back 20 million years, not just 5 or 6 million years," said Filler.

In his study and in a book published last week called "The Upright Ape -- a new origin of the Species," Filler argues that this common ancestor, and ancestors going back many millions of years before, walked upright. Homo sapiens, the human species, continued upright, while apes evolved back toward all fours, he argues.

"When you look at most ape species, their spines and most of their bodies still look pretty monkey-like," Filler said.

He also said humans evolved a new structure of muscles that pull the body from side to side while standing.

"This is very important for carrying an infant or child," Filler said. "From the point of view of back pain, now we have big muscles doing this heavy work that never did before. They can get torn and strained."

The backward orientation also allows the cushiony discs to get crushed, Filler said. "In most animals the vertebrae get spread apart when they carry infants on their backs when on all fours," he said.

What further differentiates humans from apes is the positioning of the place where the spine attaches to the hips, said Filler, who dissected the backbones of dead gibbons, chimpanzees and macaque monkeys and compared them to bones from living and extinct species of other animals and fossils from various pre-humans.
--------------------------------------------------------------------------
Copyright © 2007 Reuters Limited. All rights reserved. Republication or redistribution of Reuters content is expressly prohibited without the prior written consent of Reuters. Reuters shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon.

[mmglobal]

I think that our current design works pretty well, except that we were only intended to live to be about 40! I also don't think that our design was optimized for motocross.

Mark

[JeffreyD]

"I also don't think that our design was optimized for motocross."

I second that emotion.

And my spine votes aye.

Jeff

[ans]

Given that we lived as hunter/gatherers for > 99% of our species' time, I'm glad we have hope with surgical procedures and good pain control. Great article; this MD is impressive.

[nopain]

I read that yesterday and it's a nice theory.

Not here to get involved in the God vs. Evolution debate but you would think that over the 1,000's of years that man has supposedly "Evolved" we would be super beings by now with select breeding filtering out all the "Weak" characteristics.

That is how evolution works right? The week get filtered out and die off and the species "Evolves"?

[dshobbies]

Let us not forget that the evolutionary process is never ending. When something works well, all is well, but when not, it is slowly improved upon. Man is a relatively new species and even now, changes can be seen such as with our toes. Man does not need 5 toes for grabbing or holding onto anything, but does need a flexible digit for stability and walking. Toes will however gradually meld into a single large digit, that is if we don't kill ourselves off first.

Our backs are a weakness and I've no doubt, this same process will eventually create something stronger. I recommend some type of cage which will both maintain disc height while keeping them in place but fully flexible - and impervious to harm. However, I don't think my vote counts

We'll also probably develop a 6th finger and no doubt increase our brain's usage. I assume we'll one day be referred to as the dark ages!

On a separate note - both the ancient Myan and Chinese calanders indendently stop on December 21, 2012 so maybe it's something we won't have to worry about at all. By coincidence, astronimically speaking, a rare alignment will occur on that date.

There is yet another theory that fits well into Dr. Filler's conclusions - that man is not indiginous to the earth and did not evolve with other primates or from other bipedal ancestors.

I just love this stuff!

[ans]

Sorry that I mised this on TV:

http://www.pbs.org/wgbh/evolution/ch...ime/index.html

This where I decided it's above my head:

http://www.amazon.com/Phenotypic-Pla.../dp/0801867886