The fingers have two long flexors, located on the underside of the forearm. They insert by tendons to the phalanges of the fingers. The deep flexor attaches to the distal phalanx, and the superficial flexor attaches to the middle phalanx.
An adult can only get a maximum IQ of 161 on the Cattell III B test and 183 on Culture Fair. A top two per cent score on Cattell III B would be 148 or over, while for Culture Fair it is 132 or over. The two papers test different types of IQ.
As for your question, from the definition (as explained above) there really is no theoretical 'upper limit'. But, in practice, IIRC the highest IQ score ever recorded (200+) was for a Korean child of about 8 or 9 years of age. Also, an IQ score of more than about 140 or so usually doesn't mean much. That is, a person with an IQ of 170 may or may not be smarter than someone with an IQ of 150 on the same test. HTH Doug.