Triangles of neck: Surgical anatomy


  • Anterior & posterior triangles are separated by Sternocleidomastoid muscle
  • Posterior boundary of posterior triangle is formed by trapezius muscle
  • Anterior triangle contains 4 triangles:
    • Upper 2 triangles (separated by anterior belly of Digastric muscle):
      1. Submandibular/ Digastric triangle
      2. Submental triangle
    • Lower 2 triangles (separated by Omohyoid muscle)
      1. Carotid triangle
      2. Muscular triangle.
  • Posterior triangle is further divided into 2 triangles by Omohyoid muscle:
    1. Occipital triangle
    2. Subclavian/ Supraclavicular triangle.
  • Muscular triangle contains 4 muscles:
    1. Sternohyoid
    2. Omohyoid
    3. Thyrohyoid
    4. Sternothyroid.
  • Posterior triangle contains following important structures:
    1. Subclavian artery
    2. Nerves:
      1. Greater auricular nerve
      2. Lesser occipital nerve
      3. Transverse cervical nerve
      4. Spinal accessory nerve (CN-XI)
      5. Supraclavicular nerves.
  • MCQs:
    1. Skin over the angle of mandible is supplied by Greater auricular nerve
    2. The intermediate branch of supraclavicular nerve crosses the clavicle.

Cervical lymph nodes:

Surgical anatomy: Types of Neck Dissection


Images used in this webpage to describe the topic(s) properly to the audience might be copyrighted under other person(s) or publishing house(s) or respective company. We have solely used them for non-commercial educational purpose only; not intended to any unfair means or copyright violation. Still if you want any image(s) to be removed from this webpage, please leave a message to with proper evidence of authorization (link to original work and allegedly infringing url) and we will not hesitate to process your request as early as possible and delete the respective image(s). Thank you for cooperating with us.

How useful was this post?

Click on a star to rate it!

Average rating 5 / 5. Vote count: 8

No votes so far! Be the first to rate this post.

Leave a Reply

Your email address will not be published.