Submandibular Gland, Gross Anatomy

Description

Prominent beneath the body of the mandible, the submandibular (submaxillary) gland sits in the submandibular triangle, its superficial portion inferior and lateral to the mylohyoid and its deep portion curving around the posterior free edge of that muscle to enter the floor of the mouth. Wharton’s duct (submandibular duct) courses anteriorly along the medial aspect of the gland, then runs on the superior surface of the mylohyoid and alongside the lingual frenulum toward the sublingual caruncle. Bony landmarks from the skull and mandible, including the zygomatic bone and dentition, frame the gland’s relationship to the oral cavity and the temporomandibular joint region. Upper cervical vertebrae (including atlas and axis) provide posterior context for the suprahyoid and infrahyoid compartments. Clear orientation. That duct trajectory matters clinically because submandibular sialolithiasis most often forms within Wharton’s duct and the gland, where the long, relatively uphill course and more mucinous saliva promote obstruction, postprandial pain, and swelling. For surgical planning, the wraparound relationship to the mylohyoid explains why deep lobe disease may present as a floor-of-mouth mass, and why approaches to ductal stones must respect adjacent structures such as the lingual nerve near the posterior duct. This is a common exam and operative pitfall. Use this illustration in head and neck gross anatomy and dental curricula to teach salivary gland anatomy, ductal drainage, and surface anatomy correlations with the mandible and floor of mouth. It also suits ENT and oral and maxillofacial surgery materials covering sialadenitis, sialolith removal, submandibular gland excision, and differential diagnosis of neck masses. Anatomical accuracy verified by SciePro's Medical Advisory Board.