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Ansa cervicalis - A new classification approach.

Anatoly I Shvedavchenko1, Marine V Oganesyan1, Christian M Hammer2

  • 1Department of Human Anatomy, Federal State Autonomous Educational Institution of Higher Education I. M. Sechenov First Moscow State Medical University of the Ministry of Healthcare of the Russian Federation (Sechenovskiy University), Moscow, Russia.

Annals of Anatomy = Anatomischer Anzeiger : Official Organ of the Anatomische Gesellschaft
|November 21, 2018
PubMed
Summary
This summary is machine-generated.

Anatomical variations in the Ansa cervicalis nerve were identified in human cadavers. Most displayed a typical course, but 34% showed an external type, located lower than the internal type.

Keywords:
Ansa cervicalisInternal jugular veinSuperior margin of thyroid cartilageVariabilityVariant

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Area of Science:

  • Anatomy
  • Nerve Morphology
  • Surgical Anatomy

Background:

  • The Ansa cervicalis nerve's typical anatomical course is well-documented.
  • However, anatomical variations of the Ansa cervicalis are not fully understood.
  • This knowledge gap impacts surgical procedures in the head and neck.

Purpose of the Study:

  • To investigate and classify anatomical variants of the Ansa cervicalis.
  • To determine the prevalence of different Ansa cervicalis types.
  • To analyze the positional relationship of the Ansa cervicalis to surrounding structures.

Main Methods:

  • Conventional dissection of 54 human formalin-fixed cadavers and head and neck preparations.
  • Classification of Ansa cervicalis course as "internal type" (medial to internal jugular vein) or "external type" (lateral to internal jugular vein).
  • Measurement of Ansa cervicalis distance relative to the superior thyroid cartilage margin.

Main Results:

  • 66% of specimens exhibited the typical "internal type" Ansa cervicalis.
  • 34% displayed the "external type" Ansa cervicalis.
  • The "external type" was significantly lower positioned relative to the thyroid cartilage compared to the "internal type".

Conclusions:

  • Anatomical variations of the Ansa cervicalis are common, with a significant prevalence of the "external type".
  • The "external type" Ansa cervicalis is positioned lower than the "internal type".
  • Understanding these variations is crucial for safe surgical navigation in the neck region.