- Adductor pollicis muscle
Name = Adductor pollicis muscle
Latin = musculus adductor pollicis
GraySubject = 126
GrayPage = 462
Caption = The muscles of the thumb. (Adductor pollicis transversus is red band at bottom, and adductor pollicis obliquus is red band immediately above it.)
Caption2 = Front of the left
forearm. Deep muscles. (Adductor pollicis visible at bottom center.)
Origin = Transverse head: anterior body of the
Oblique head: bases of the second and the
third metacarpals and the adjacent trapezoidand capitatebones
Insertion = medial side of the base of the
proximal phalanxof the thumband the ulnar sesamoid
adductsthe thumb at the carpometacarpal joint
Abductor pollicis longus muscle, Abductor pollicis brevis muscle
deep branch of the ulnar nerve(T1)
DorlandsPre = m_22
DorlandsSuf = 12548366
The adductor pollicis muscle is a
musclein the handthat functions to adduct the thumb. It has two heads: transverse and oblique.
The oblique head (occasionally known as 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 brevisand the transverse head of the adductor pollicis, is inserted into the ulnar side of the base of the proximal phalanx of the thumb, a sesamoidbone being present in the tendon.
A considerable fasciculus, however, passes more obliquely beneath the tendon of the
flexor pollicis longusto join the lateral portion of the flexor pollicis brevisand the abductor pollicis brevis.
The transverse head (also known as 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
metacarpalbone; the fibers converge, to be inserted with the medial part of the flexor pollicis brevisand the oblique head into the ulnar side of the base of the proximal phalanx of the thumb.
radial arterypasses between the two heads, travelling from the back of the hand into the palm, where it forms the deep palmar arch.
The adductor pollicis is innervated by the deep branch of the
"Adduction of the thumb" is bringing it back into the plane of the palm of the hand from its previously abducted position. This muscle, however, also brings the thumb to the side of the palm and index finger.
Froment's Sign is used to test for a compromised adductor pollicis muscle.
* - "Palm of the hand, superficial dissection, anterior view"
* [http://www.ptcentral.com/muscles/musclearms.html#adductor%20pollicis PTCentral]
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