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  4. Why Does A Sea Sponge Have No Brain And No Nervous System ?
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Why Does A Sea Sponge Have No Brain And No Nervous System ?

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Offline neilep (OP)

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Why Does A Sea Sponge Have No Brain And No Nervous System ?
« on: 09/03/2012 18:34:48 »
Dearest Spongeologists,

Happy Friday !


As a sheepy I of course luff sea sponges...It's obvious isn't it ?..Me...sheepy, four legged woolly land loving grass eating ruminant....Sponge..sea dwelling idiot !!...blatant isn't it ?



Take a look at Epaderm....

 [ Invalid Attachment ]

Epaderm Trying Do To Sums Yesterday !

As ewe can see Epaderm almost got the kweschun right...close but no pancake roll I think the phrase is.....anyway..we all know the real answer...is...erhmm........ sausage !



Apparently despite not really being the sharpest tool in the cream cake (I'm sure I got that phrase right !!)...Epaderm is sheeposed to be an animal and yet Epaderm does not have a brain and nor does he even have a nervous system !!...why's that then ?

Why Does A Sea Sponge NOT Have A Brain Or A Nervous System ?




Ewe see...I just do not know and knowing this will mean I do know !



Hugs and shmishes]


mwah mwah mwah

Neil

Hai ku To Sponge



Oh Sponge !
You're a sponge
Yes ewe are !



Quality Hai ku'age there and ewe know it !!





* 1sponge.jpg (40.03 kB, 798x493 - viewed 2670 times.)
« Last Edit: 09/03/2012 18:37:10 by neilep »
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Offline RD

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Re: Why Does A Sea Sponge Have No Brain And No Nervous System ?
« Reply #1 on: 09/03/2012 22:46:01 »
apparently sponges do have something analogous to a nervous system ...

Quote
Sponge cells can communicate with each other via calcium signalling, or by other means; new research suggests that sponges express a group of proteins which conglomerate together to produce a partly synaptic formation.
https://en.wikipedia.org/wiki/Nerve_net#Nerve_Net_Evolution
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Offline Jessica H

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Re: Why Does A Sea Sponge Have No Brain And No Nervous System ?
« Reply #2 on: 01/05/2012 15:10:08 »
I think the basic point is that the brain didn't evolve yet.   Sponges were probably the first animals to evolve.  The brain came along later, maybe encouraged by the evolution of bilateral symmetry, meaning animals like worms are right-left mirror images and therfore store have a head region.   Sponges don't have a head and rear; they are circular.   The evolution of a head would allow all the sensory organs and nerves to concentrate in one area, leading to a brain.
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