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Related Experiment Videos

The scalene tubercle.

V R Mysorekar1, R N Kulkarni, R R Kulkarni

  • 1Department of Anatomy, M. S. Ramaiah Medical College, Bangalore.

Indian Journal of Medical Sciences
|June 1, 1991
PubMed
Summary
This summary is machine-generated.

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The scalene tubercle on the first rib is inconsistent, but the scalenus anterior muscle impression is nearly always present. Associated arterial and venous grooves are typically shallow and confined to the medial part of the rib surface.

Area of Science:

  • Anatomy
  • Morphology
  • Human Osteology

Background:

  • The first rib is a critical anatomical structure in the thoracic inlet.
  • Understanding the morphology of the first rib, including the scalene tubercle and associated grooves, is important for surgical and clinical contexts.

Purpose of the Study:

  • To investigate the morphological characteristics of the scalene tubercle and related structures on the first rib.
  • To determine the prevalence and extent of the muscular impression for the scalenus anterior muscle.
  • To describe the morphology and extent of the arterial and venous grooves on the superior surface of the first rib.

Main Methods:

  • Macroscopic examination of 130 right and 114 left first ribs from a random collection.
  • Detailed study of the presence and characteristics of the scalene tubercle.

Related Experiment Videos

  • Analysis of the muscular impression for the scalenus anterior muscle.
  • Identification and description of the arterial and venous grooves.

    • Main Results:

    • The scalene tubercle was not consistently present.
    • The muscular impression for the scalenus anterior muscle was almost constant, extending to the medial third of the superior surface.
    • The arterial groove was generally shallow, located posterior to the tubercle/impression, and extended to the medial two-thirds.
    • The venous groove was mostly shallow, located anterior to the tubercle/impression, and extended to the medial two-thirds.
    • No distinct groove for the lower trunk of the brachial plexus was observed.

    Conclusions:

    • The muscular impression of the scalenus anterior muscle is a more reliable landmark than the scalene tubercle on the first rib.
    • The arterial and venous grooves have predictable locations and extents, generally limited to the medial portion of the superior surface.
    • The absence of a separate brachial plexus groove suggests its close relationship with other structures in this region.