We're still chilling in the thumb and moving on with our 'short thumb muscles'
Opponens Pollicis is small and deep but has a special action - read on!
Muscle attachment points:
Origin: flexor retinaculum and tubercle of the trapezium
((connective tissue on the inside of your wrist & a carpal (tiny wrist bone) that lives just below the thumb))
Insertion: entire length of first metacarpal (thumb) bone - radial side
((all along the side of your thumb !))
Opponens Pollicis performs important task of pulling the thumb across the palm aka opposition!
Opposition of the thumb happens at the carpo-metacarpal joint* (bringing the pads of the thumb and pinky finger together!
*where wrist and thumb meet