Anatomy study note · Upper limb
Extensor pollicis brevis
A deep extensor whose tendon runs with APL along the lateral border of the anatomical snuffbox.
Key points
- Back of radius → base of the proximal phalanx of the thumb.
- Deep radial nerve.
- Lateral border of the snuffbox.
- Limb muscles: in situ from limb-bud mesenchyme.
- Upper limb bud C4–T2; lower limb bud L2–S2.
- Skeletal muscle: multinucleated, peripheral nuclei, striated.
- Epimysium → perimysium → endomysium.
The full note in the atlas also covers
Origin · Insertion · Action · Nerve supply · Histology · Development
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Written from
- Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 309, 463
- Inderbir Singh’s Human Embryology, ch. 7, PDF p. 109; ch. 10, PDF pp. 142–145
- BRS Cell Biology & Histology, 7th ed., ch. 8, PDF pp. 135–144
More from the upper limb
- Extensor pollicis longus
- Extensor retinaculum of the wrist
- Flexor carpi radialis
- Flexor carpi ulnaris
- Flexor digitorum profundus
- Flexor digitorum superficialis
- Flexor pollicis longus
- Flexor retinaculum and carpal tunnel
- Humerus
- Hypothenar muscles
- Infraspinatus
- Intercarpal and carpometacarpal joints
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