Genioglossus Muscles Under the Skin, Inferior View

Description

Emerging from the inner surface of the anterior mandible at the superior mental spines (genial tubercles), the paired genioglossus muscles fan posteriorly and superiorly to form the central bulk of the tongue, their fibers interdigitating with intrinsic lingual musculature near the midline septum. From an inferior, upward-looking perspective beneath the skin of the male craniofacial and upper neck region, the genioglossus sits superior to the geniohyoid and mylohyoid, while the tongue base relates posteriorly to the oropharynx and soft palate. Superiorly, the hard palate and maxillary dentition frame the oral cavity, and the choanae and nasal septum are visible above the palate. Orientation is clear. Genioglossus is the primary tongue protrusor, but clinically it is discussed more often as an airway muscle: loss of tonic activity during sedation or sleep allows posterior displacement of the tongue base toward the posterior pharyngeal wall, contributing to obstructive sleep apnea and difficult mask ventilation. Because it is supplied by the hypoglossal nerve (CN XII), unilateral weakness produces tongue deviation toward the affected side on protrusion, a bedside finding that correlates well with lesions from neck surgery, carotid endarterectomy, or skull base pathology. For airway procedures, this inferior viewpoint clarifies why mandibular advancement, jaw thrust, and hypoglossal nerve stimulation improve patency by repositioning the tongue relative to the soft palate, vallecula, and laryngeal inlet. Dental anatomy, speech and swallowing lectures, and head and neck dissection labs can all use this plate to teach tongue musculature in the same field as the palate, pharynx, and laryngeal framework, with clear spatial relationships for exam questions and operative planning. It also suits anesthesia, sleep medicine, and ENT publications discussing tongue base obstruction, airway maneuvers, and hypoglossal neuropathy. Anatomical accuracy verified by SciePro's Medical Advisory Board.