Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

'By far the greatest danger of Artificial Intelligence is that people conclude too early that they understand it'

 

Eliezer Yudkowsky

Brains evolved multiple times and converged on similar designs

RATE THIS! +10
Posted in Science on 22nd May, 2014 07:14 PM by AlexMuller

Our brains, perched atop a network of nerve cells that ascend the length of our bodies, are thought to have arisen once in an animal hundreds of millions of years ago and then evolved over time. However, new findings suggest instead that brains and nervous systems originated multiple times from scratch.

 
The findings, published today in Nature, highlight an ancient and gelatinous marine predator called a comb jelly. Unlike pulsating jellyfish, comb jellies swim by “rowing” their many hair-like cilia, which are arranged in rows called combs. They possess rudimentary brains and sophisticated nervous systems replete with elongated cells that communicate through synapses much like our own.
 
Some comb jellies show mirror-like bilateral symmetry, as do we. And like most animals, their muscles derive from a middle tissue layer, which does not exist in jellyfish or sponges, another ancient type of aquatic creature. 
 
So it’s little wonder that biologists have long placed the comb jelly group close to worms, flies, and humans on the evolutionary tree of life; sponges emerge at the base, meaning that this group appeared first.
 
In this traditional view, complex body parts like the brain and muscles arose gradually, and only once, since those parts look similar across related animals, and the chances of that same evolutionary process being repeated seems slim.
 
But this scenario was shaken by a report in Science last year, which suggested that the comb jelly group emerged before jellyfish and even the brainless, muscle-less sponges, more than 550 million years ago. 

Tags: brainbiologyevolutionneuroscienceanimals

Read original article » Back to category

Comments

Author: Guest
Posted: 2016-05-06
+0
Your post is a timely cobtuinrtion to the debate Reply


 

Recent headlines

  • Posted in Business on 2017-03-28 14:55:07
    Bots shift towards AI and garner $24 billion of investment..read more
    Posted in Science on 2017-03-28 14:45:33
    Musk launches company to pursue 'neural lace'.....read more
    Posted in Science on 2017-03-28 14:29:14
    No one knows what to do with the International Space Station..read more
    Posted in Business on 2017-03-27 19:48:26
    Tech world debate on robots and jobs heats up..read more
    Posted in Science on 2017-03-27 19:37:58
    Chemical energy storage with water heating solar panels.....read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Intensive medical treatment can reverse type 2 diabetes..read more
    Posted by AlexMuller
    Daily consumption of tea protects the elderly from cognitive.....read more
    Posted by AlexMuller
    New analysis method of metabolites accurately predicts whether.....read more
    Posted by AlexMuller
    Unproven stem cell 'therapy' blinds three patients at Florida.....read more
    Posted by AlexMuller
    Indigenous South American group has healthiest arteries of all.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me