Anatomy study note · Upper limb
Abductor pollicis longus
A deep extensor-compartment muscle whose tendon forms the lateral border of the anatomical snuffbox with extensor pollicis brevis.
Key points
- Back of radius + ulna → base of MC1.
- Deep radial nerve.
- Abducts + extends the thumb.
- Lateral border of the snuffbox (with EPB).
- 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 · Clinical notes
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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
- Acromioclavicular joint
- Adductor pollicis
- Anconeus
- Axillary artery
- Axillary lymph nodes
- Axillary nerve
- Axillary vein
- Basilic vein
- Biceps brachii
- Brachial artery
- Brachial plexus
- Brachialis
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