The so called inca bone, also known as the preinterparietal bone or os Inca, is a triangular sutural bone located at the previous site of the posterior fontanelle. It is common and a normal variant. The inca bone is one of the Wormian bones.
It is so called because of the supposed high incidence of inca bones in Peruvian mummies.
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- 2. S.B. Nayak "Multiple Wormian bones at the lambdoid suture in an Indian skull" Neuroanatomy (2008) 7: 52–53