Anterior triangle

Last revised by Daniel J Bell on 21 Apr 2023

Citation, DOI, disclosures and article data

Citation:

Kanagarajah A, Bell D, Hacking C, et al. Anterior triangle. Reference article, Radiopaedia.org (Accessed on 04 Dec 2023) https://doi.org/10.53347/rID-54108

DOI:

https://doi.org/10.53347/rID-54108

Permalink:

https://radiopaedia.org/articles/54108

rID:

54108

Article created:

22 Jun 2017, Arjna Kanagarajah

Disclosures:

At the time the article was created Arjna Kanagarajah had no recorded disclosures.

View Arjna Kanagarajah's current disclosures

Last revised:

21 Apr 2023, Daniel J Bell ◉

Disclosures:

At the time the article was last revised Daniel J Bell had no financial relationships to ineligible companies to disclose.

View Daniel J Bell's current disclosures

Revisions:

7 times, by 4 contributors - see full revision history and disclosures

Systems:

Head & Neck

Sections:

Anatomy

Synonyms:

Anterior triangle of the neck
Anterior triangles of the neck

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

Gross anatomy

The anterior triangle is an inverted triangle with its base above and the apex pointing downwards at the manubrium of the sternum. It can be further subdivided into smaller triangles by the crossing of the digastric and omohyoid muscles.

The anterior triangle is subdivided into three paired triangles and a single midline triangle:

Paired triangles:

Single midline triangle:

submental triangle

Boundaries

anterior: median line of the neck
posterior: anterior margin of sternocleidomastoid muscle
base: inferior border of the mandible

Related pathology

Determining the nature or origin of masses in the anterior triangle is difficult clinically. Radiological investigations are paramount in defining the origin and the extent of these masses. Head and neck tumors often metastasize to lymph nodes in the neck. A significant proportion of patients with head and neck malignancy have lymph node metastasis in the neck on presentation. Therefore understanding the anatomical position of lymph nodes in the neck help to stage the disease and aids in the planning of surgical management.