Cosmic voids

[Magpie]

Introspection curls into itself
like a threatened millipede   - love the simile but think it would be stronger as a metaphor 'Introspection is a threatened millipede that...'
leaving only terror, as one drifts within;  - confused by 'one' here, wondering who or what is 'one'
without warmth or sight for light years:  - undecided about 'within;without' together, it jars slightly
forgotten in the pocket of the universe   - like the 'pocket' analogy
amongst its lint and detritus.                 - can you have detritus in your pocket, obviously yes, but usually? Now according to spell check 'amongst' is a spelling mistake and upon researching it google reckons that it is archaic American English and that among and amongst are interchangeable, but 'among' sounds wrong when said out loud so I don't know why I've mentioned it (especially in basic critique).
Also additional - 'light years' seems like a measurement of time the way it is mentioned here, although I know what you mean. May need fixing, may just be me.

Their nerves stretch out like branches  - back to wondering who or what 'their' is
sensitive to the slightest stimuli
sensing nothing, hearing nothing:
overloading the senses.  - lots of 'sense' repetition here

They can’t scream,
because there is no air.
They can’t dream,
the void is waiting there.  - back to the 'they' question

It would disturb the silence anyways;  - ahh please get rid of 'anyways' its so teen and you're a mature genious
it would be rude to break its long standing record. 



They submit to acceptance,
and drift forever.

I've probably written too much for basic so I'll lie and say I thought we were in mild critique.
Cheers for the read.

Extra for free -- If you do an edit it's best policy to put your most recent version at the top and then subsequent previous versions underneath so that readers can follow the progress of the poem. I only say this because i've noticed that previously you have just edited. I used to do the same, but then after the 137th time they released the hounds and I've not done it since 
There's a thread somewhere that explains how to do it, I'll pretend to look for it whilst really hoping that Tiger will leap out and post the link

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FFS I found it straight away http://www.pigpenpoetry.com/thread-19301.html
Easy Tiger - no work to do here