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[milo]

Hello

You have written a poem here which seems to compare a medical analysis or physical procedure to an emotional or psychological examination

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I invite knives,
So curious a thing
Must be dissected.
Make a slit and
Slide away skin.

So, we have invite which lets us know that the narrator invites this process.  I am fine with the word choice and sonics through here.  There is a disconnect between knives - curious thing.  i think thing intends to refer to something else but there is no hint from the words.  I think throughout the whole poem you may wish to re-think your line breaks.  "and" in particular is a pretty bad line break.

Is the skull
Lumpy
or a finger
Too long?
Cut a flap,

more weak lines through here.  Is "Lumpy" pulling its weight as a whole line?  "or a finger"  .  I don't think so.

Expose the insides
An x-ray flash.

x-rays are invisible so you may want a different word than flash here

Compare. Contrast.
Open the mouth,
Position the legs,
Put a finger here,

There is something pseudo sexual here and if it is intended, it might make sense to build on it.

There.
Protect yourself
With latex.
Separate the heart
With wires,
From the chamber
To the cell,
Exhibit
With your stain
Fix the brain,
An example.

additional lines that I don't think hold their own as a line: "There", With latex", "With wires", Exhibit" - really any one word lines or lines with just a preposition and another word

I like the spark of the poem and I think it has a lot of potential.  I think you should strongly re-think your structure.  Also, I think you should consider letting the reader in on more of the "secrets"  Consider additional verbiage with extra meaning that could point to your central metaphor.  Maybe a little more thought to the music of the piece as well.

Thanks for posting, I am looking forward to a revision