Origin
The scaphoid and trapezium bones and the transverse carpal ligament.
Insertion
Proximal phalanx of the thumb.
Blood supply
Superficial palmar arch.
Nerve supply
Median nerve.
Action
The abductor pollicis brevis controls movement of the thumb. It helps to straighten the thumb and move the thumb away from the fingers. It also helps the tip of the thumb to touch the tips of all the other fingers of the hand.
Disease/Injury
Injury and strain to this muscle is higher due to sports like wrestling, soccer, football, skiing, etc.
Muscle Exercise
Repeatedly squeezing a rolled towel with your hand and holding it in that position for 10 seconds for about 5 repetitions helps to strengthen this muscle.
Interesting Facts
This muscle gives high degree of flexibility in the thumb which is not available in other fingers.
