Inferior Longitudinal Muscle of the Tongue

Description

Anteriorly within the open oral cavity, the inferior longitudinal muscle runs as a paired intrinsic band along the ventral surface of the tongue, extending from the region of the lingual apex posteriorly toward the body of the tongue. Its fibers lie deep to the lingual mucosa and inferior to the superior longitudinal muscle, closely related laterally to the genioglossus and the sublingual space. Surrounding context includes the mandible with the dental arcade (incisors through molars), the buccinator forming the lateral oral wall, and the masseter positioned more laterally on the mandibular ramus; inferior to the mandibular body, the anterior belly of the digastric is shown in the suprahyoid region. Clear landmarks. Functionally, the inferior longitudinal muscle shortens the tongue and pulls the apex inferiorly, actions that matter in bolus control and the lingual phase of swallowing, where subtle changes in tongue shape affect oral clearance. This ventral, near-field view also supports clinical teaching around tongue deviation patterns, since intrinsic muscle impairment differs from hypoglossal nerve palsy affecting genioglossus, and it helps orient the operator during oral cavity exam when evaluating ventral tongue lesions near the frenulum and floor of mouth. Surgeons working around the sublingual gland and Wharton duct benefit from a precise sense of how close ventral tongue musculature sits to the sublingual space. Use this plate for head and neck anatomy labs, dental and speech-language pathology coursework, and oral and maxillofacial surgery texts that need a defensible depiction of intrinsic tongue musculature in relationship to the mandible, teeth, and suprahyoid muscles. It also fits patient-education materials on tongue mobility after glossectomy or floor-of-mouth procedures. Anatomical accuracy verified by SciePro's Medical Advisory Board.