Extensor pollicis brevis muscle

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Extensor pollicis brevis muscle
Front of right upper extremity. (Extensor pollicis brevis labeled at upper left.)
Image:Musculusextensorpollicisbrevis.png
Posterior surface of the forearm. Deep muscles. (Extensor pollicis brevis visible at left.)
Latin	musculus extensor pollicis brevis
Gray's	subject #125 455
Origin:	radius
Insertion:	thumb, proximal phalanx
Artery:	posterior interosseous artery
Nerve:	posterior interosseous nerve
Action:	extension of thumb at metacarpophalangeal joint
Antagonist:	Flexor pollicis longus muscle, Flexor pollicis brevis muscle
Dorlands/Elsevier	m_22/12548946

The Extensor pollicis brevis lies on the medial side of, and is closely connected with, the Abductor pollicis longus.

Contents 1 Origin and insertion 2 Action 3 Variations 4 Additional images 5 External links

Origin and insertion

It arises from the dorsal surface of the body of the radius below that muscle, and from the interosseous membrane.

Its direction is similar to that of the Abductor pollicis longus, its tendon passing the same groove on the lateral side of the lower end of the radius, to be inserted into the base of the first phalanx of the thumb.

Action

The Extensor pollicis brevis extends the proximal phalanx.

Variations

Absence; fusion of tendon with that of the Extensor pollicis longus.

Additional images

Anatomical-snuff-box.jpg Anatomical snuff box	Bones of left forearm. Posterior aspect.	Bones of the left hand. Dorsal surface.	Tendons of forefinger and vincula tendina.
Transverse section across distal ends of radius and ulna.	Transverse section across the wrist and digits.	The mucous sheaths of the tendons on the back of the wrist.	The radial and ulnar arteries.
Arteries of the back of the forearm and hand.

External links

• LUC epb
• 40566785 at GPnotebook
• Extensor+pollicis+brevis+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 As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e List of muscles of upper limbs
VERTEBRAL COLUMN	trapezius - latissimus dorsi - rhomboid (major, minor) - levator scapulae
THORACIC WALLS	pectoralis major - pectoralis minor - subclavius - serratus anterior
SHOULDER	deltoid - rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) - teres major
ARM	anterior compartment: coracobrachialis - biceps brachii - brachialis posterior compartment: triceps brachii - anconeus
FOREARM	anterior compartment: superf. - pronator teres - palmaris longus - flexor carpi radialis - flexor carpi ulnaris - flexor digitorum superficialis anterior compartment: deep - pronator quadratus - flexor digitorum profundus - flexor pollicis longus posterior compartment: superf. - mobile wad (brachioradialis, extensor carpi radialis longus and brevis) - extensor digitorum, - extensor digiti minimi - extensor carpi ulnaris posterior compartment: deep - supinator - anatomical snuff box (abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus) - extensor indicis
HAND	lateral volar - thenar (opponens pollicis, flexor pollicis brevis, abductor pollicis brevis) - adductor pollicis medial volar - hypothenar (opponens digiti minimi, flexor digiti minimi brevis, abductor minimi digiti) - palmaris brevis intermediate - lumbrical - interossei (dorsal, palmar)

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