Flexor Pollicis Brevis

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Original Author(s): Oliver Jones
Last updated: October 12, 2022
Revisions: 3

Original Author(s): Oliver Jones
Last updated: October 12, 2022
Revisions: 3

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The flexor pollicis brevis is a thenar muscle located within the hand. It forms the medial aspect of the thenar eminence and is described as having a superficial and deep part (although the deep component is variable in size).

  • Attachments: Originates from the tubercle of the trapezium and from the associated flexor retinaculum. Attaches to the base of the proximal phalanx of the thumb.
  • Actions: Flexes the metacarpophalangeal joint of the thumb.
  • Innervation: Median nerve (recurrent branch). The deep head is innervated by the deep branch of the ulnar nerve.
  • Blood supply: Superficial palmar arch

Figure 1 – Palmar view of the thenar muscles.