- Opponens pollicis muscle
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Opponens pollicis muscle 
The muscles of the thumb 
The muscles of the left hand. Palmar surface. Latin musculus opponens pollicis Gray's subject #126 461 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 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.
Contents
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.
Actions
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.
Blood Supply
The opponens pollicis receives its blood supply from the Superficial palmar arch.
Additional images
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Bones of the left hand. Volar surface.
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Transverse section across the wrist and digits.
External links
- LUC op
- -1368719349 at GPnotebook
- SUNY Labs 08:st-0416
- opponens+pollicis+muscle at eMedicine Dictionary
- PTCentral
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
List of muscles of upper limbs (TA A04.6, GA 4.432) Shoulder deltoid · rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) · teres major
fascia: Deltoid fascia · Supraspinous fascia · Infraspinous fasciaArm
(compartments)OtherForearm OtherHand Lateral volarMedial volarhypothenar (opponens digiti minimi, flexor digiti minimi brevis, abductor digiti minimi) · palmaris brevisIntermediateposterior: Extensor retinaculum · Extensor expansion
anterior: Flexor retinaculum · Palmar aponeurosisCategories:- Muscles of the upper limb
- Muscle stubs
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См. также в других словарях:
opponens pollicis muscle — musculus opponens pollicis … Medical dictionary
opponens pollicis — opponens pol·li·cis päl ə səs n a small triangular muscle of the hand that is located below the abductor pollicis brevis, arises from the trapezium and the flexor retinaculum of the hand, is inserted along the radial side of the metacarpal of the … Medical dictionary
musculus opponens pollicis — [TA] opposing muscle of thumb: origin, tubercle of trapezium, flexor retinaculum; insertion, radial side of first metacarpal; innervation, sixth and seventh cervical through median; action, flexes and opposes thumb … Medical dictionary
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