Which nerve supplies the submandibular gland?

The submandibular gland is primarily supplied by the facial nerve, which plays a crucial role in the innervation of the gland. The facial nerve provides parasympathetic fibers that originate from the superior salivatory nucleus in the brainstem. These fibers travel via the chorda tympani branch of the facial nerve, which merges with the lingual nerve (a branch of the mandibular division of the trigeminal nerve) to reach the submandibular gland. This innervation is essential for the gland's function of salivation.

In contrast, the glossopharyngeal nerve primarily innervates the parotid gland, while the vagus nerve is involved in various autonomic functions but does not directly supply the submandibular gland. The trigeminal nerve, particularly through its lingual nerve branch, is more focused on sensory functions in the oral cavity rather than parasympathetic innervation of salivary glands. Therefore, understanding the role of the facial nerve in the autonomic regulation of the submandibular gland is key in dental nursing practice.