I always assumed my brother and I were identical twins. Now my mother, in her eighties, says we are cisternal twins, but I cannot find any references on the matter. Is there such a thing? If so, what traits make them so?

appended: also, we've been called mirror twins. In a study by a student, we learned that our fingerprints are nearly exact opposites.

  • 5
    $\begingroup$ Most likely she means fraternal, or dizygotic twins. betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/… $\endgroup$ – Luigi Nov 12 '14 at 21:00
  • $\begingroup$ that's not it; ty for the guess but I'd like something more definitive. I explicitly mean "Cisternal". I know what fraternal means. $\endgroup$ – Riverborne Nov 13 '14 at 13:55

Cisternal doesn't make sense in this context, so either your mother is using an obscure term (quite possible, these things change a lot) or just has the wrong word.

However, mirror twins are a known thing (and quite cool): http://www.twinsuk.co.uk/twinstips/4/140/twin-pregnancy--multiple-births/types-of-twins--identical-fraternal--unusual-twinning/.

She may have meant something like "chiral twins" or "cis-trans twins", which would be borrowing from a similar concept in chemistry to describe your mirror-image nature (but is, again, not a phrase I've heard in the twin literature.)

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.