Flexor Pollicis Longus Muscle

**Semantic type:** Body Part, Organ, or Organ Component

**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.

**Synonyms:** - FLEXOR POLLICIS LONGUS MUSCLE