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2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

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3970116 No.3970116 [Reply] [Original]

What is the purpose of the lazarus reflex?

>> No.3970139

shameless self bump

>> No.3970162

>>3970139
an extension of myself?
interesting

>> No.3970176

In itself, nothing. It's just an interesting phenomenon.

>> No.3970182

For those who haven't seen it:
http://www.youtube.com/watch?v=Nty6bICZlyA
I wasn't expecting a video like this on youtube but there you go.

>> No.3970184

>>3970176
but to have developed it should have conferred some advantage, otherwise it doesn't make sense.

>> No.3970190

>>3970184
why would you want it to make sense? do you believe in god or somethin?

>> No.3970193
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3970193

mfw i read the wikipedia description...

WAT

>> No.3970200

>>3970184
It's likely a random effect of other adaptations affecting the brain stem.

>> No.3970209

>>3970184
It could be to protect the body during a tumble which results in unconsciousness. It both protects the long bones from being broken through leverage and offers additional protection to the abdomen and thorax.

>> No.3970215

These movements can ensure the brain dead patient is protected from early burial or cremation as friends and family may believe they still have a chance to recover, slightly raising their probability of survival and future reproduction.

>> No.3970216

Hmm, that's entirely uninteresting, maybe you should kill yourself.

>> No.3970225

>>3970209
Exactly what I thought, protection of the body during an unconscious state or something.

>> No.3970222

>>3970190
wat, no. Evolution is driven by gaining advantages. My question is what this reflex offers that is advantageous to not having it.
>>3970200
Being a reflex it is separate to the brain stem.
>>3970209
thanks for the input

>> No.3970230

>>3970222
Shut the fuck up you ignorant idiot.

>> No.3970238

>>3970222
There are artefacts in evolution that may have once served a niche purpose and no longer do. It just hasn't been selected against or anything.

>> No.3970257

>>3970230
except he's right

>> No.3970259

>>3970222
As I understand, Evolution is not about keeping that which improves the organism, it's also about keeping things that don't bother much (little toe, tailbone,etc). Some things just kind of hang around and don't represent an evolutionary advantage.

>> No.3970283

>>3970238
>>3970259
I concur but I couldn't see the advantage to our ancestors either though protection when tumbling seems both interesting and viable.

>> No.3970304

it is not advantageous or disadvantageous for the survival

>> No.3970318

>>3970304
well it wouldn't develop ex nihilo..

>> No.3970329

>>3970318

is out of the nervs physiology, can't tell you how exactly

>> No.3970333

what is the purpose of feet fingers ...

>> No.3970562

>>3970318

Why would you say ex nihilo instead of out of nothing? Are you latin? Or are you just trying to sound cute and smart on the internet, fuck off.

>> No.3970832

http://en.wikipedia.org/wiki/Decorticate_posturing

>> No.3970843

The first is the disinhibition of the red nucleus with facilitation of the rubrospinal tract. The rubrospinal tract facilitates motor neurons in the cervical spinal cord supplying the flexor muscles of the upper extremities. The rubrospinal tract and medullary reticulospinal tract biased flexion outweighs the medial and lateral vestibulospinal and pontine reticulospinal tract biased extension in the upper extremities.
The second component of decorticate posturing is the disruption of the lateral corticospinal tract which facilitates motor neurons in the lower spinal cord supplying flexor muscles of the lower extremities. Since the corticospinal tract is interrupted, the pontine reticulospinal and the medial and lateral vestibulospinal biased extension tracts greatly overwhelm the medullary reticulospinal biased flexion tract.

The effects on these two tracts (corticospinal and rubrospinal) by lesions above the red nucleus is what leads to the characteristic flexion posturing of the upper extremities and extensor posturing of the lower extremities.