Posterior triangle of the neck

Posterior Triangle Of The Neck

Anatomy Less

Posterior triangle of the neck

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The posterior triangle (or lateral cervical region) is a region of the neck.


It has the following boundaries:

Apex: Union of the sternocleidomastoid and the trapezius muscles at the superior nuchal line of the occipital bone

Anterior: Posterior border of the sternocleidomastoideus

Posterior: Anterior border of the trapezius

Base: Middle one third of the clavicle


The posterior triangle is crossed, about 2.5 cm above the clavicle, by the inferior belly of the Omohyoideus, which divides the space into two triangles:


A) Nerves and Plexuses: B) Vessels: C) Lymph Nodes:
  • Occipital
  • Supraclavicular
D) Muscles:
  • Inferior belly of omohyoid muscle
  • Anterior Scalene
  • Middle Scalene
  • Posterior Scalene
  • Levator Scapulae Muscle
  • Splenius Muscle

Clinical significance

The Accessory Nerve (CN XI) is particularly vulnerable to damage at lymph node biopsy, where damage results in an inability to shrug the shoulders or raise the arm above the head (eg, for brushing hair).

The external jugular vein's superficial location also makes it vulnerable to......
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