The muscle of hand that contains a sesamoid bone is
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
Flexor pollicis brevis
Flexor pollicis longus
Opponens pollicis
Adductor pollicis
Upper limb