The adductor pollicis muscle has two heads both on the palmar side of the hand. The transverse head has its origin at the volar crest of the third metacarpal of the hand. The oblique head is attached to the ligaments of the capitate bone at the base of the second or third metacarpal. These heads join into an insertion on the ulnar side of the proximal phalanx of the thumb. Its motions have to do with the adduction of the thumb.
The adductor pollicis gets its innervation from the ulnar nerve, which has its origin at the eighth cervical vertebra. The functioning of the innervation of the adductor pollici is tested by looking for Froment's sign. In order to perform this test, the patient is asked to hold a piece of paper in a pinch grip between the thumb and forefinger. The test is to try to pull the paper out. In a normal hand there should be reasonable resistance, whereas in palsy of the adductor fromis the paper will pull out very easily.
The nerve that controls the adductor pollicis is the motor branch of the ulnar nerve. The adductor pollicis is mainly involved with the thumb, and it is the most superficial of the thenar group. The ulnar nerve is the main nerve that runs the length of the ulna bone (the bigger of the two "forearm" bones) and is responsible for all the nerves in the hand.
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Ulnar nerve is the nerve that controls the adductor pollicis in hand.
Ulnar nerve is the nerve that is not protected by any bone or muscle, that is why it can be damaged easily. It is the nerve that is near Ulna bone, directly connected to the little finger and the adjacent half to the ring finger supplying the palmer side of these fingers including tips and finger nail beds. It is the largest nerve of the body.