Cover Image




INTRODUCTION-Inca is the ethnic sign, depicting the triangular architectural monument design of Inca tribes in south Andes America. Among whom, the members of royal family wore a crown like configuration on their head called as Inca..Rivero and Tschudy in the year 1851 first described the Inca bones in the skull, which resembled the tribal sign. Skull is divided as neurocranium and viscerocranium and consists of 28 bones which are paired and unpaired in nature. The bones are fused by intramembranous and endochondral ossification, the suture by synostosis. Premature fusion of sutures will result in bony malformations. Islands of bones formed are called as  sutural or wormian (supernumerary, Inca) bones which are  commonly associated within the lambdoid suture. AIM  OBJECTIVE-To report the skull based variation called as OS INCA with its morphometrical analysis which carries significance during medicolegal examination, while eliciting radiological  diagnosis to rule out the skull fractures, during neurosurgical interventions for burr hole surgeries and while doing   anthropological analysis. CASE REPORT-During routine    osteological session for undergraduate students, we observed a skull with interparietal (Inca) bone) near lambdoid suture. It is of asymmetrical bipartite type and has been reported with its measurements from the nearby bony prominences and foramen, by using the vernier caliper. The observation was discussed with the previous pioneer studies. CONCLUSION-Thus the                 interparietal bone has been made as a case report which is of asymmetrical bipartite type we are recommending a future scope for this study by adding a radiological correlation and also to find out the incidence of Inca bones in our population.


Full Text:



Badkur DS, Sharma V,Badkur P.Medicolegal importance of Inca bone on forensic identification.J Indian Acad Forensic Med.2011 Oct – Dec;33(4).

Cirpan S,Aksu F,Mas N.Inca bone in Human skulls of the west Anatolian population.Int .J.Morphol.2014 ;32(1):275-278.

Kumud D.Os incae morphometric, clinical and medicolegal perspectives.J.Anat.Soc.India.2011;60(2):218-223.

Mayuri SP,Desai SG,Gupta S.A study of interparietal bone in 105 human skulls of Gujarat population.J Med Sci.2011 june;3(1).

Murlimanju BV.Variant morphogenesis of squamous part of occipital bone in human skulls.J.Morphol.Sci.2010; 27(4):139-141.

Natekhar PE,Natekhar SE.Inca bones at asterion.Indian journal of otology.2014 oct;29(4).

Padmaja V.Rare unilateral wormian bone on coronal suture and multiple sutural bones on lambdoid suture- a case report.IOSR journal of dental sciences and medical sciences.2013 jul-aug;9(2):22-23.

Susan standring.Exterior of the skull.40th ed.China, elsevier, 2008:409-413.

Sharma v ,Jeewane S,Marskone S,Soni R.Os Inca totum – anthropological and embryological basis.PJSR.2014 jan;7(1).

Srijit D,Suri R,Kapur V.Anatomical observations on os inca.Medica.2005;64(2).

Udupi S,Jayanthi S.Inca bone – a case report.IJAV.2011; 4:90-92.


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

An Initiative of The Tamil Nadu Dr M.G.R. Medical University