Genioglossus Muscle Visible in a Sagittal Section of the Male Head and Neck

Description

Arising from the superior mental spine on the lingual surface of the mandibular symphysis, the genioglossus spreads posteriorly and superiorly in a broad fan of fascicles to form much of the tongue’s anterior bulk in this male sagittal section. Its inferior fibers course toward the hyoid region, while superior fibers arc toward the dorsum of the tongue, lying anterior to the oropharyngeal airway and superior to the floor of mouth. Posteriorly, the tongue base approaches the epiglottic region, with the hyoid bone inferior and slightly anterior to the laryngeal inlet. Key neighbors in this midline context include the hard palate superiorly, teeth and mandibular body anteriorly, and the pharyngeal wall posteriorly, with the trachea and esophagus positioned inferiorly in the neck. Genioglossus is the principal tongue protrusor and a primary dilator of the upper airway, so a sagittal presentation like this helps clarify why loss of tone predisposes to retrolingual collapse in obstructive sleep apnea. The fiber orientation also matters in airway management: posterior displacement of the tongue during sedation can narrow the oropharynx, and maneuvers such as jaw thrust effectively advance the mandibular attachment and the genioglossus-tongue complex. This cut also supports teaching of hypoglossal nerve (CN XII) motor function, where unilateral weakness produces tongue deviation toward the side of the lesion on protrusion. Ideal for head and neck anatomy coursework, sleep medicine and anesthesia teaching files, and surgical education discussing transoral access corridors and the relationship of tongue base to the epiglottis and hyoid. It also suits textbook diagrams on mastication and swallowing when paired with the masseter and suprahyoid region. Anatomical accuracy verified by SciePro's Medical Advisory Board.