Geniohyoid Muscle (Head And Neck, Sagittal Section)

Description

Running anteroposteriorly in the floor of the mouth, the geniohyoid lies superior to the mylohyoid and inferior to the genioglossus, extending from the inferior mental spine (genial tubercle) of the mandible to the anterior body of the hyoid bone. A mid-sagittal cutaway also places it anterior to the pharyngeal wall and superior to the laryngeal inlet, with the mandibular symphysis and dentition seen anteriorly and the cervical vertebrae stacked posteriorly. Just inferior and posterior, the suprahyoid and infrahyoid layers define the hyoid’s position relative to the tongue base and upper airway. Clear relationships. Clinically, this view matters because the geniohyoid is a direct contributor to anterior and superior excursion of the hyoid during the oral and pharyngeal phases of swallowing, a movement coupled to epiglottic inversion and upper esophageal sphincter opening. When suprahyoid function is reduced, as in post-stroke dysphagia or after head and neck cancer treatment, impaired hyoid displacement correlates with residue and aspiration risk, and the sagittal plane is where that mechanics is easiest to teach. Surgeons and anatomists also use these relationships when planning or explaining submental approaches (for example, access around the genial region or hyoid suspension concepts) and when distinguishing geniohyoid from adjacent mylohyoid and genioglossus on imaging and dissection. Ideal for gross anatomy and head and neck modules that emphasize suprahyoid anatomy, swallowing biomechanics, and midline landmarks, and for speech-language pathology or otolaryngology teaching materials that need a clean sagittal correlation to videofluoroscopic concepts. It also supports figure plates for clinical texts describing dysphagia rehabilitation targets and the muscular attachments that translate mandibular movement to hyoid elevation. Anatomical accuracy verified by SciePro's Medical Advisory Board.