← neck Triangles Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All What makes up the Posterior triangle? trapezius, clavicle, SCM What makes up the carotid triangle? omohyoid, SCM, posterior belly of digastric What makes up the submandibular triangle? mandible, 2 angles of digastric What makes up the submental triangle? Digastric anterior belly and hyoid bone. Describe contents of neck from anterior neck to posterior skin, superficial fascia (1), platysma (2), clavicle (3), subclavian vein (4), phrenic nerve (5), anterior scalene muscle (6), subclavian artery (7), brachial plexus (8), middle scalene muscle (9), posterior scalene muscle.