"origin: posterior surfaces of ulna, radius and interosseous membrane"
"insertion: via tendon, usually dividing into two slips, one attaching to the base of 1st metacarpal, the other attaching to the trapezium"
"arterial supply: proximally by the posterior interosseous artery and distally by a branch from the anterior interosseous artery"
"innervation: posterior interosseous nerve (C7, C8), a continuation of the deep branch of the radial nerve (C7, C8)"
"action: abducts and extends the thumb at the carpometacarpal joint"
"origin: posterior surfaces of ulna, radius and interosseous membrane"
"insertion: via tendon, usually dividing into two slips, one attaching to the base of 1st metacarpal, the other attaching to the trapezium"
"arterial supply: proximally by the posterior interosseous artery and distally by a branch from the anterior interosseous artery"
"innervation: posterior interosseous nerve (C7, C8), a continuation of the deep branch of the radial nerve (C7, C8)"
"action: abducts and extends the thumb at the carpometacarpal joint"
"origin: posterior surfaces of ulna, radius and interosseous membrane"