- Adductor pollicis muscle
Muscle infobox
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 leftforearm . Deep muscles. (Adductor pollicis visible at bottom center.)
Origin = Transverse head: anterior body of thethird metacarpal
Oblique head: bases of the second and thethird metacarpal s and the adjacenttrapezoid andcapitate bones
Insertion = medial side of the base of theproximal phalanx of thethumb and theulnar sesamoid
Action =adducts the thumb at thecarpometacarpal joint
Antagonist =Abductor pollicis longus muscle ,Abductor pollicis brevis muscle
Blood =
Nerve =deep branch of the ulnar nerve (T1)
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12548366
The adductor pollicis muscle is amuscle in thehand that functions to adduct the thumb. It has two heads: transverse and oblique.tructure
Oblique head
The oblique head (occasionally known as adductor obliquus pollicis) arises by several slips from the
capitate bone , the bases of the second and thirdmetacarpal s, the intercarpal ligaments, and the sheath of the tendon of theflexor 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, asesamoid bone being present in the tendon.A considerable fasciculus, however, passes more obliquely beneath the tendon of the
flexor pollicis longus to join the lateral portion of theflexor pollicis brevis and theabductor pollicis brevis .Transverse head
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
metacarpal bone; the fibers converge, to be inserted with the medial part of theflexor pollicis brevis and the oblique head into the ulnar side of the base of the proximal phalanx of thethumb .Relations
The
radial artery passes between the two heads, travelling from the back of the hand into the palm, where it forms thedeep palmar arch .Innervation
The adductor pollicis is innervated by the deep branch of the
ulnar nerve .Actions
"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.
=AdditionalExternal links
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* - "Palm of the hand, superficial dissection, anterior view"
* [http://www.ptcentral.com/muscles/musclearms.html#adductor%20pollicis PTCentral]
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