Abductor Pollicis Brevis. Specifically, the muscle is used in thumb adduction, which is movement toward the plane of the palm .The adductor pollicis is made up of two separate heads which work together but have different origins. Origin. Posted on Jul 21st, 2020 / Published in: Hand/Fingers/Thumb General information. If there is a problem with the adductor pollicis, a test known as Froment’s sign is used to check for an issue with the attaching nerve. Adductor pollicis. Two muscles that the adductor pollicis works with include the adductor pollicis longus and adductor pollicis brevis. Both these muscles are specifically involved in movement of the thumb. To perform this test, the patient holds a thin object with the index finger and thumb and attempts to hold on while the object is pulled away. Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. Muscles involved in abduction. If there is a problem with the adductor pollicis, a test known as Froment’s sign is used to check for an issue with the attaching nerve. This muscle is responsible for the thumb's abduction, and also plays a role in opposition of the thumb. Two muscles that the adductor pollicis works with include the adductor pollicis longus and adductor pollicis brevis. Different muscles of the hand work together to achieve movement. Both heads also attach to the proximal phalanx — the first bone of the thumb after the knuckle. For example, the transverse head of the muscle is located deeper in the hand. These are known as the oblique and transverse heads. Movement of the thumb away from the midline of the hand. It also has a more triangular shape than the oblique head. Movement of the thumb from abducted position back to anatomical position. Abduction of the thumb is defined as the movement of the thumb anteriorly, a direction perpendicular to the palm. Muscle involved in adduction. The abductor pollicis brevis does this by acting across both the carpometacarpal joint and the metacarpophalangeal joint. A healthy adductor pollicis will allow the patient to maintain grip, while an issue with the nerve will cause this to be more difficult. It takes its origin from the front of transverse carpal ligament, extending into the tubercles of scaphoid and trapezium with an occasional contribution from the tendon of abductor pollicis longus.. Insertion Adduction occurs when the thumb is brought back in line with the palm of the hand, usually when it was already abducted away from this plane. The transverse head has its origin on the third metacarpal bone, which is found in the hand. Adduction. The innervation of the muscle is via the ulnar nerve.