Where did the name Achilles tendon come from?
The legend was that his goddess mother had, when a baby, dipped him in the Styx River to make him immune from death, however by holding him by the back of the ankle, that part was not dipped, and so that was his ‘achilles heel’ which crafty Paris took advantage of with his arrow rather than a face to face fight which he was sure to lose. Hence the tendon has come into popular expressions as the achilles tendon and achilles heel.