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The second annular pulley: a histologic examination

F D Ellis1, J G Seiler, C W Sewell

  • 1Department of Orthopaedic Surgery, Emory University, Atlanta, GA, USA.

The Journal of Hand Surgery
|July 1, 1995
PubMed
Summary
This summary is machine-generated.

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The finger

Area of Science:

  • Anatomy
  • Histology
  • Biomechanics

Background:

  • The annular pulleys are crucial for finger flexion.
  • Understanding their structure is key to treating tendon injuries.

Purpose of the Study:

  • To investigate the histological structure of the second annular pulley.
  • To correlate structure with function in the pulley apparatus.

Main Methods:

  • Histological analysis of 15 fresh frozen finger specimens.
  • Staining techniques included hematoxylin-eosin, Verhoeff-Van Gieson (Elastin), Masson's trichrome, and hyaluronic acid detection.

Main Results:

  • Identified three distinct layers in the second annular pulley.
  • Outer layer: vascularized, continuous with membranous sheath.

Related Experiment Videos

  • Middle layer: radially oriented collagen, significant elastin, resists bowstringing.
  • Inner layer: longitudinally oriented collagen, modified fibroblasts secreting hyaluronic acid for gliding.

    • Conclusions:

    • The three layers of the second annular pulley are specialized for distinct functions.
    • These layers facilitate vascular supply, structural integrity, and efficient flexor tendon gliding.