Anterior Triangle of Neck Flashcards
Triangles of the neck
Sternocleidomastoid (SCM)
Divides anterior from posterior triangle
Boundaries of the Anterior Triangle
Anterior border
Imaginary midline of neck
Boundaries of the Anterior Triangle
Posterior border
Anterior border of SCM
Boundaries of the Anterior Triangle
Base
Mandible
Divisions of the Anterior Triangle
Divisions of Anterior Triangle
Submental
Submental lymph nodes and beginning of anterior jugular vein
Divisions of Anterior Triangle
Submandibular
Submandibular salivary gland, lymph nodes, fascial artery and vein, carotid sheath, hypoglossal nerve etc
Divisions of Anterior Triangle
Carotid
Carotid sheath, branches of external carotid artery, internal jugular vein, hypoglossal accessory and vagus nerves etc
Divisions of Anterior Triangle
Muscular
Sternohyoid and sternothyroid form the floor beneath which lies the thyroid gland, larynx, trachea and oesophagus
Contents of Anterior Triangle
Fascia of Anterior Neck
Platysma
Attachments
From fascia above pectoralis major and clavicle to lateral neck and onto mandible
Platysma
Innervation
Facial nerve CN VII
Veins of Head/Neck
Supra-hyoid muscles
Function
Raise hyoid bone or depress mandible (mylohyoid and digastric)
Supra-hyoid muscles
Innervation
Facial nerve - posterior belly of digastric and stylohyoid
Mandibular division of trigeminal CNV3 - anterior belly of digastric and mylohyoid
Supra-hyoid muscles
Geniohyoid
Deep to mylohyoid - Innervated by C1 via hypoglossal CN XII
Infrahyoid Muscles
Function
Depress hyoid bone