I was dissecting a sheep's brain for my students and one of them asked a question about the corpora quadrigemina he asked why did two of them(the superior colliculus) look more red than the other two and I have no idea why was that. also I read several topics about it but in the photos there was no such thing as I saw. can you help me with that?can it be due to any wrong doing in dissection procced? any help is appericiated

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    $\begingroup$ It would help a great deal to post a picture alongside the question, and tell us something about the fixation method that was used (if any), and how old the brain was, where it came from, how it was extracted from the animal etc $\endgroup$ – AliceD Oct 27 '20 at 8:01
  • $\begingroup$ Redness can almost certainly be associated with incomplete blood drain. Perhaps the perfusion was improperly executed and the circle of Willis broke. I have found empirically that the superior colliculus is particularly at risk when that happens. $\endgroup$ – vkehayas Oct 27 '20 at 9:33
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    $\begingroup$ @AliceD and I'm trying to find info about how the brain was extracted and some other details and will of course mention them here. thanks for your help $\endgroup$ – infinite Oct 27 '20 at 9:51
  • $\begingroup$ @vkehayas as I said I'm trying to find some details but probably you are right. thanks a lot for your help $\endgroup$ – infinite Oct 27 '20 at 9:52

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