Triangle Borders Vessels and Nerves



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Triangles of the Neck:

Triangle

Borders

Vessels and Nerves

Other Contents

Anterior Triangle

Anterior border of SCM (laterally), inferior border of mandible (superiorly), and midline of the neck (medially)

Common carotid arteries and their branches: the external and internal carotids

Internal jugular vein and its tributaries



Cranial Nerves [VII], [IX], [X], [XI], and [XII], Transverse Cervical Nerve (from cervical plexus), and upper and lower roots of the ansa cervicalis

Thyroid and parathyroid glands, cricoid cartilage, esophagus, trachea

Submandibular

Inferior border of mandible, anterior and posterior digastric bellies

[XII], mylohyoid nerve, facial artery and vein

Suprahyoid muscles, submandibular gland, submandibular lymph nodes

Submental

Hyoid, anterior digastric belly, and midline

Tributaries to anterior jugular vein

Suprahyoid muscles, submental lymph nodes

Muscular

Hyoid bone, superior omohyoid belly, anterior border of SCM, and midline




Infrahyoid muscles, thyroid and parathyroid glands, pharynx

Carotid

Superior omohyoid belly , stylohyoid, posterior digastric belly, and anterior border of SCM

Tributaries to common facial vein, cervical branch of [VII], common carotid artery, external and internal carotid arteries, superior thyroid a., ascending pharyngeal a., facial and lingual aa., occipital a., internal jugular vein, [X], [XI], [XII], superior and inferior roots of ansa cervicalis, and transverse cervical nerve




Posterior Triangle

SCM (anteriorly), trapezius (posteriorly), middle 1/3 clavicle (basally), occipital bone (apically)

External jugular vein, posterior external jugular vein, subclavian artery and vein, transverse cervical artery, suprascapular artery, [XI], branches of cervical plexus, brachial plexus

Inferior belly of omohyoid

Subclavian

SCM, omohyoid, clavicle

Subclavian branches, phrenic nerve

Anterior scalene


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