Os orbitale.
1,276 adult Indian skulls were examined through the orbit to see the incidence of supernumerary ossicles. Only one skull showed the presence of a supernumerary ossicle in the roof of the orbit (0.8%)--the os orbitale.
D006801:Humans; D007194:India; D009915:Orbit / Q000033:anatomy & histology*; D012886:Skull / Q000033:anatomy & histology; D013100:Sphenoid Bone / Q000033:anatomy & histology; D044465:White People