Posterior triangle

The posterior triangle forms the posterior compartment of the neck and is separated from the anterior triangle by the sternocleidomastoid muscle. The triangles of the neck are surgically focussed, first described from early dissection-based anatomical studies which predated cross-sectional anatomical description based on imaging (see deep spaces of the neck).

Boundaries

The inferior belly of the omohyoid that crosses the triangle divides it into an inferior supraclavicular and superior occipital triangles

Contents

The posterior triangle contains level 5 lymph node chains. These include spinal accessory and transverse cervical nodes. Depending on the location of the nodes above or below the accessory nerve, they are sub grouped as level 5a (above) or level 5b (below). 

Head and neck anatomy
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Article information

rID: 54113
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:

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