Chickens' insteps

Posted by CTRL on May 19, 2007

I know that people refer to small/non-existent muscles as "chickens' insteps", but where did this expression originate? How can a muscle look like the inner part of a chicken's foot?

• Chickens' insteps R. Berg 20/May/07
  • Chickens' insteps RRC 20/May/07
    • Chickens' insteps David FG 21/May/07
      • Chickens' insteps RRC 21/May/07