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1. Greater occipital artery + nerve emerge at the apex to pass up to the scalp.
2. Occipital LN.
3. Supraclavicular LN.
4. Accessory nerve emerges from the SCM halfway down its posterior border and passes vertically downwards overlying the levator scapulae, embedded within the fascia of the roof of the triangle, to disappear beneath the anterior border of the trapezius 5cm abover the clavicle.
5. Cutaneous branches of the cervical plexus pierce the investing fascia at the posterior border of the SCM (Erb's point).
6. Inferior belly of the omohyoid crosses the lower part of the triangle and is held in place by a sling of investing fascia.
7. Transverse cervical + suprascapular vessels pass at the lower part, above the clavicle.
8. The 3rd part of the subclavian artery is lower down.


1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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