The genioglossus is an extrinsic muscle of the tongue. It is a large, thick muscle, which contributes significantly to the shape of the tongue. Attachments: Arises from the mandibular symphysis. It inserts onto the body of the hyoid bone and the entire length of the tongue. Function: Protrusion (‘sticking the tongue out’) and depression of the tongue. Innervation: Hypoglossal nerve. Blood supply: Lingual artery with contributions from the tonsillar artery. By TeachMeSeries Ltd (2025) Fig 1The extrinsic muscles of the tongue. Note the palatoglossus muscle is not included in this illustration. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article