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.
The former method allows us to give a maximum IQ score directly limited by the test and normative sample; e.g., the WAIS-IV has a ceiling IQ of, I think, 160, so someone who gets every item right on the test can only be given an IQ of 160+.