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Abductor pollicis brevis

Dr Daniel J Bell ◉ and Dr Nafisa Shakir Batta et al.

The abductor pollicis brevis is a thin subcutaneous muscle located laterally in the thenar eminence of the hand, and is one of the intrinsic muscles of the hand.

Summary

origin: mainly from the flexor retinaculum
- few fibers originate from the tubercles of scaphoid and trapezium and tendon of abductor pollicis longus
- accessory slips may originate from the long and short pollicial extensors (extensor pollicis longus and extensor pollicis brevis), the opponens pollicis or radial styloid process
insertion: its medial fibers are attached by a thin, flat tendon to the radial side of the proximal phalangeal base in the pollex and lateral fibers join the pollicial dorsal digital expansion
innervation: lateral branch of median nerve (C8 and T1)
action: abducts the thumb and medially rotates it at the carpometacarpal and metacarpophalangeal joints

References

Anatomy: Upper limb

skeleton of the upper limb
- clavicle
  - conoid tubercle
  - supraclavicular foramen
- scapula
- humerus
  - supracondylar spur
  - olecranon foramen
- radius
- ulna
- carpal bones (mnemonic)
  - scaphoid
    - bipartite scaphoid
  - lunate
    - lunate morphology
  - triquetrum
  - pisiform
  - trapezium
  - trapezoid
  - capitate
  - hamate
  - variants
    - carpal coalition
      - lunotriquetral coalition
      - capito-hamate coalition
- metacarpals
- phalanges
  - terminal tuft
- accessory ossicles of the upper limb
  - accessory ossicles of the shoulder
    - os acromiale
  - accessory ossicles of the elbow
    - os supratrochleare dorsale
    - patella cubiti
  - accessory ossicles of the wrist (mnemonic)
    - os centrale carpi
    - os epilunate
    - os styloideum
    - os hamuli proprium
    - lunula
    - os triangulare
    - trapezium secondarium
    - os paratrapezium
    - os radiostyloideum (persistent radial styloid)
joints of the upper limb
- shoulder joint
  - articulations
  - associated structures
    - joint capsule
    - bursae
      - subacromial-subdeltoid (SASD) bursa
      - subscapular recess
      - subcoracoid bursa
      - coracoclavicular bursa
      - supra-acromial bursa
    - ligaments
      - coracoclavicular ligament
        
        conoid ligament
        
        trapezoid ligament
      - costoclavicular ligament
  - movements
    - scapulothoracic joint
      - scapular retraction (adduction)
      - scapular protraction (abduction)
      - scapular elevation
      - scapular depression
      - scapular lateral rotation
      - scapular medial rotation
    - glenohumeral joint
      - arm flexion
      - arm extension
      - arm abduction
      - arm adduction
      - arm internal rotation (medial rotation)
      - arm external rotation (lateral rotation)
      - circumduction
  - blood supply - scapular anastomosis
  - ossification centers
- elbow joint
  - proximal radioulnar joint
  - ligaments
    - medial (ulna) collateral ligament complex
    - lateral (radial) collateral ligament complex
  - associated structures
    - bicipitoradial bursa
    - olecranon bursa
  - movements
  - alignment
  - blood supply - elbow anastomosis
  - development
    - elbow ossification (mnemonic)
    - elbow ossification centers
- wrist joint
  - articulations
  - ligaments
    - intrinsic ligaments
    - extrinsic ligaments
  - associated structures
    - extensor retinaculum
    - flexor retinaculum
    - joint capsule
  - movements
  - alignment
    - carpal arcs
  - ossification
- hand joints
  - articulations
    - carpometacarpal joint
      - triscaphe joint
    - metacarpophalangeal joint
      - palmar ligament (plate)
      - collateral ligament
    - interphalangeal joint
      - palmar ligament (plate)
      - collateral ligament
  - movements
spaces of the upper limb
muscles of the upper limb
blood supply to the upper limb
- arteries
- veins
innervation of the upper limb
- intercostobrachial nerve
- brachial plexus (mnemonic)
  - branches from the roots
  - branches from the trunks
    - suprascapular nerve
  - branches from the cords
    - lateral cord
      - lateral pectoral nerve
    - posterior cord
    - medial cord
  - terminal branches
    - ulnar nerve
    - radial nerve
      - posterior interosseous nerve (deep radial nerve)
      - superficial radial nerve
    - musculocutaneous nerve
    - axillary nerve
    - median nerve
      - anterior interosseous nerve
      - bifid median nerve
lymphatic drainage of the upper limb
- axillary lymph nodes

Article information

rID: 42960

System: Musculoskeletal

Section: Anatomy

Tag: anatomy, thumb, wrist, upper limb, hand, musculoskeletal, muscle

Synonyms or Alternate Spellings:

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