Anatomy study note · Upper limb

Flexor digitorum profundus

The deep long flexor of the fingers. Its tendons pass through those of FDS to reach the distal phalanges, and give origin to the lumbricals.

Key points

• Ulna + interosseous membrane → distal phalanges of fingers 2–5.
• Dual nerve: median (index, middle) + ulnar (ring, little).
• Only muscle that flexes the DIP joints.
• Lumbricals arise from its tendons.
• 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

Sign in free to see it on the 3D model, read the full note and practise questions on it.

Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 3, PDF pp. 308, 316–317
• 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 digitorum superficialis
• Flexor pollicis longus
• 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

Privacy policy · Designed by DATXOC LLC.