Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/05/20 01:52:27」(JST)

wiki en

The opponens pollicis is a small, triangular muscle in the hand, which functions to oppose the thumb. It is one of the three thenar muscles, lying deep to the abductor pollicis brevis and lateral to the flexor pollicis brevis.

Structure

The opponens pollicis originates from the flexor retinaculum of the hand and the tubercle of the trapezium. It passes downward and laterally, and is inserted into the whole length of the metacarpal bone of the thumb on its radial side.

Innervation

Like the other thenar muscles, the opponens pollicis is innervated by the recurrent branch of the median nerve.

Blood supply

The opponens pollicis receives its blood supply from the Superficial palmar arch.

Function

Opposition of the thumb is a combination of actions that allows the tip of the thumb to touch the tips of other fingers. The part of opposition that this muscle is responsible for is the flexion of the thumb's metacarpal at the first carpometacarpal joint. This specific action cups the palm. Many texts, for simplicity, use the term opposition to represent this component of true opposition. In order to truly oppose the thumb, the actions of a number of other muscles are needed at the thumb's metacarpophalangeal joint.

Additional images

The muscles of the thumb
The muscles of the right hand. Palmar surface.
Opponens pollicis muscle
Bones of the left hand. Volar surface.
Transverse section across the wrist and digits.
Opponens pollicis muscle
Opponens pollicis muscle
Opponens pollicis muscle
Opponens pollicis muscle
Opponens pollicis muscle
Opponens pollicis muscle
Opponens pollicis muscle
Muscles of hand. Cross section.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 手指の解剖学 finger and thumb anatomy
2. 手根管症候群に対する外科手術 surgery for carpal tunnel syndrome
3. 手根管症候群の病因 etiology of carpal tunnel syndrome
4. 手根管症候群の治療 treatment of carpal tunnel syndrome
5. 頚部痛および頚椎症の患者の評価 evaluation of the patient with neck pain and cervical spine disorders

English Journal

Ultrasonographic quantification of intrinsic hand muscle cross-sectional area; reliability and validity for predicting muscle strength.

Mohseny B1, Nijhuis TH2, Hundepool CA1, Janssen WG3, Selles RW4, Coert JH1.
Archives of physical medicine and rehabilitation.Arch Phys Med Rehabil.2014 Dec 4. pii: S0003-9993(14)01277-5. doi: 10.1016/j.apmr.2014.11.014. [Epub ahead of print]
OBJECTIVE: (i) To investigate whether ultrasonographic measurement of the cross-sectional area (CSA) of the intrinsic hand muscles muscle can be used to predict muscle strength in a valid and reliable manner, and (ii) to determine if this method can be used for follow-up of patients with peripheral
PMID 25482051

Wakefulness delta waves increase after cortical plasticity induction.

Assenza G1, Pellegrino G2, Tombini M3, Di Pino G3, Di Lazzaro V3.
Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology.Clin Neurophysiol.2014 Oct 12. pii: S1388-2457(14)00534-3. doi: 10.1016/j.clinph.2014.09.029. [Epub ahead of print]
OBJECTIVE: Delta waves (DW) are present both during sleep and in wakefulness. In the first case, DW are considered effectors of synaptic plasticity, while in wakefulness, when they appear in the case of brain lesions, their functional meaning is not unanimously recognized. To throw light on the latt
PMID 25631611

Influence of motor imagery of isometric opponens pollicis activity on the excitability of spinal motor neurons: a comparison using different muscle contraction strengths.

Bunno Y1, Yurugi Y1, Onigata C2, Suzuki T2, Iwatsuki H1.
Journal of physical therapy science.J Phys Ther Sci.2014 Jul;26(7):1069-73. doi: 10.1589/jpts.26.1069. Epub 2014 Jul 30.
[Purpose] This study aimed to determine the differences in the excitability of spinal motor neurons during motor imagery of a muscle contraction at different contraction strengths. [Methods] We recorded the F-wave in 15 healthy subjects. First, in a trial at rest, the muscle was relaxed during F-wav
PMID 25140099

Japanese Journal

Influence of Motor Imagery of Isometric Opponens Pollicis Activity on the Excitability of Spinal Motor Neurons: A Comparison Using Different Muscle Contraction Strengths

, , , ,
Journal of Physical Therapy Science 26(7), 1069-1073, 2014
[Purpose] This study aimed to determine the differences in the excitability of spinal motor neurons during motor imagery of a muscle contraction at different contraction strengths. [ …
NAID 130004677702

等尺性収縮を用いた母指対立運動の運動イメージが脊髄神経機能の興奮性に与える影響 : 30%と50%収縮強度運動イメージの効果比較

文野住文,鬼形周恵子,鈴木俊明
理学療法科学 27(6), 711-715, 2012-12-20
NAID 10031148321

等尺性収縮を用いた母指対立運動の運動イメージが脊髄神経機能の興奮性に与える影響 : 30%と50%収縮強度運動イメージの効果比較

文野住文,鬼形周恵子,鈴木俊明
理学療法科学 27(6), 711-715, 2012-12
NAID 40019565557

「母指対立筋」

Opponens pollicis muscle
	The deep muscles of the left hand. Dorsal surface.
	The superficial muscles of the left hand. Palmar surface.
Details
Origin	trapezium and transverse carpal ligament
Insertion	metacarpal bone of the thumb on its radial side
Artery	Superficial palmar arch
Nerve	Recurrent branch of the median nerve
Actions	Flexion of the thumb's metacarpal at the first carpometacarpal joint, which aids in opposition of the thumb
Identifiers
Latin	Musculus opponens pollicis
Dorlands; /Elsevier	m_22/12549981
TA	A04.6.02.058
FMA	37379
	Anatomical terms of muscle [edit on Wikidata]