The muscle of hand that contains a sesamoid bone is: (A) Flexor pollicis brevis, (B) Flexor pollicis longus, (C) Opponens pollicis, (D) Adductor pollicis
Answer is D. The tendon of inseion of adductor pollicis on the medial side of base of proximal phalanx of thumb contains a sesamoid bone.Reference: Textbook of anatomy, Upper limb, and thorax, Vishram Singh, 2nd edition, page no.144