Memorization tips re
gr   kephale enkephalon = head thus skull ... and  
      phalos = round as in phallus  omphalos  
+ CEPHALOSPORIN, a produce derived from a 
a spore producing Penicillin  
sug> CEPHALOSPORIUM

+ BICEPHALIC or CRANIOPAGUS points to "double or duplicated "cephalon or being fused "at the head". A mostly lethal duplication malformation except perhaps for reptilians where many examples of living such creatures were noted. In Mythology, note that the Lernean Hydra had nine heads. Among conjoined twins ("Siamese" twins), craniopagus is for "attached at the cranium or cephalon". Pagus implies "attachement" found in Spanish "apegado" and "pagos" for "attachment to a "turf" and "pagar" for "to pay". Conjoined twins are always monozygotic (identical twins that are attached) - common attachment points are body ends or openings - cranio, cephalo, gnatho (jaw), thoraco, omphalo (umbilicus area), ischio (pelvic), etc., giving rise to "cephalo-pagus"; "thoraco-pagus"  and so on. The attachment sites impact the viability or survival prognosis of the twins - attachment sites determine what organs may be shared or malformed. (Search sources for Medical Humanities - Ethics and for Images). 

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