Anatomy study note · Upper limb

Flexor pollicis longus

The deep long flexor of the thumb, in its own synovial sheath in the carpal tunnel.

Key points

• Anterior radius → distal phalanx of the thumb.
• Anterior interosseous nerve.
• Flexes the thumb IP joint.
• Own synovial sheath (radial bursa).
• 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. 308, 317–318
• 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

• Flexor retinaculum and carpal tunnel
• Humerus
• Hypothenar muscles
• Infraspinatus
• Intercarpal and carpometacarpal joints
• Interossei of the hand
• Latissimus dorsi
• Levator scapulae
• Long thoracic nerve
• Lumbricals of the hand
• Medial cutaneous nerves of arm and forearm
• Median cubital vein

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