Adductor pollicis

Adductor pollicis muscle
The superficial muscles of the left hand. Palmar view Adductor pollicis is labelled at bottom right.
Details
Origin	Transverse head: anterior body of the third metacarpal Oblique head: bases of the second and the third metacarpals and the adjacent trapezoid and capitate bones
Insertion	medial side of the base of the proximal phalanx of the thumb and the ulnar sesamoid
Artery	deep palmar arch
Nerve	deep branch of the ulnar nerve (T1)
Actions	adducts the thumb at the carpometacarpal joint
Antagonist	Abductor pollicis longus muscle, Abductor pollicis brevis muscle
Identifiers
Latin	Musculus adductor pollicis
TA	A04.6.02.059
FMA	37380
Anatomical terms of muscle []

In human anatomy, the adductor pollicis muscle is a muscle in the hand that functions to adduct the thumb. It has two heads: transverse and oblique.

It is a fleshy, flat, triangular, and fan-shaped muscle deep in the thenar compartment beneath the long flexor tendons and the lumbrical muscles at the center of the palm. It overlies the metacarpal bones and the interosseous muscles.

The oblique head (Latin: adductor obliquus pollicis) arises by several slips from the capitate bone, the bases of the second and third metacarpals, the intercarpal ligaments, and the sheath of the tendon of the flexor carpi radialis.

From this origin the greater number of fibers pass obliquely downward and converge to a tendon, which, uniting with the tendons of the medial portion of the flexor pollicis brevis and the transverse head of the adductor pollicis, is inserted into the ulnar side of the base of the proximal phalanx of the thumb, a sesamoid bone being present in the tendon.

A considerable , however, passes more obliquely beneath the tendon of the flexor pollicis longus to join the lateral portion of the flexor pollicis brevis and the abductor pollicis brevis.

The transverse head (Latin: adductor transversus pollicis) is deeply seated.

It is triangular, arising by a broad base from the lower two-thirds of the palmar surface of the third metacarpal bone; the fibers converge, to be inserted with the medial part of the flexor pollicis brevis and the oblique head into the ulnar side of the base of the proximal phalanx of the thumb.