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Musculus lumbricalis pollicis.

G Lister1

  • 1Division of Plastic Surgery, University of Utah, Salt Lake City 84132.

The Journal of Hand Surgery
|July 1, 1991
PubMed
Summary
This summary is machine-generated.

A newly identified muscle, the musculus lumbricalis pollicis, was found in six thumb hypoplasia cases. Its unique anatomy can worsen the first web space deficiency, leading to its excision in all observed instances.

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Area of Science:

  • Anatomy
  • Hand Surgery
  • Congenital Hand Anomalies

Background:

  • Thumb hypoplasia is a congenital condition affecting hand development.
  • Anomalous muscles can occur in congenital hand anomalies, impacting function.
  • The first web space is crucial for thumb abduction and opposition.

Purpose of the Study:

  • To describe a previously uncharacterized muscle, the musculus lumbricalis pollicis.
  • To understand the anatomical and functional significance of this muscle in thumb hypoplasia.
  • To evaluate the clinical implications of the musculus lumbricalis pollicis in affected individuals.

Main Methods:

  • Surgical observation in six patients with thumb hypoplasia.
  • Detailed anatomical dissection and description of the anomalous muscle.

Related Experiment Videos

  • Intraoperative assessment of muscle attachments and potential function.

    • Main Results:

    • A novel muscle, termed musculus lumbricalis pollicis, was identified originating from the flexor pollicis longus tendon.
    • This muscle traversed the first web space to insert into the index finger's extensor hood.
    • Traction on the muscle caused index finger interphalangeal joint extension.
    • The muscle's contraction was observed to further narrow the deficient first web space.

    Conclusions:

    • The musculus lumbricalis pollicis is a significant finding in thumb hypoplasia.
    • Its anatomical course and action can exacerbate first web space constriction.
    • Excision of the musculus lumbricalis pollicis was performed in all identified cases.