NCIt definition : A muscle that originates on the anterior surface of the radius and interosseous membrane
and inserts into the palmar aspect of the base of the distal phalanx of the thumb;
It is involved in flexion of the thumb and is supplied by the anterior interosseous
branch of the median nerve and the radial and anterior interosseous arteries.;
Alternative definition : CDISC: A muscle in the forearm, in general extending from the anterior surface of
the radius and interosseous membrane to the palmar aspect of the base of the distal
phalanx of the thumb; primary function is flexion of the thumb.;