Rider's bones are ossification of: (A) Adductor brevis, (B) Adductor longus, (C) Adductor magnus, (D) Flexor digitorum superficialis
Answer is B. Rider's bone develops in the tendon of adductor longus in professional riders. It is a sesamoid bone.that has no periosteum and ossifies after bih. Reference: BD Chaurasia's handbook of general anatomy, 5th edition, pg 55