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Palmar aponeurosis

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"palmar aponeurosis"

Palmar aponeurosis is the thick central part of the deep fascia of the palm.
Key points:
  • Triangular fibrous sheet in the palm
  • Apex is continuous with the palmaris longus tendon (if absent, attached to flexor retinaculum)
  • Fibers fan distally toward digits, mainly index to little finger
  • Has longitudinal fibers reinforced by transverse fibers
  • Lies superficial to important structures:
    • digital vessels and nerves
    • long flexor tendons
  • Function: protects deeper structures, stabilizes palmar skin for grip, helps maintain palmar architecture and compartment boundaries
Clinical relevance:
  • Dupuytren contracture is progressive fibrosis/thickening of palmar fascia/aponeurosis, commonly affecting ring and little fingers, causing fixed flexion deformity and reduced hand function.
Textbook figure:
Palmar aponeurosis anatomy
Sources:
  • Gray’s Anatomy for Students, p. 476
  • General Anatomy and Musculoskeletal System (THIEME Atlas), p. 369
  • Imaging Anatomy: Bones, Joints, Vessels and Nerves, p. 618
Recent evidence check:
  • No meta-analysis/systematic review in the last 2 years found on PubMed specifically for “palmar aponeurosis.”
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