Opponens Pollicis (2 of 4 short thumb muscles)

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 !))

Muscle Action:

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