|Nerve: Lingual nerve|
The mouth cavity. The apex of the tongue is turned upward, and on the right side a superficial dissection of its under surface has been made.
The lingual nerve is a branch of the mandibular division of the trigeminal nerve (CN V3), which supplies sensory innervation to the tongue. It also carries fibers from the facial nerve, which return taste information from the anterior two thirds of the tongue.
It also carries nerve fibers that are not part of the trigeminal nerve, including the chorda tympani nerve of the facial nerve, which provides special sensation (taste) to the anterior 2/3 part of the tongue as well as parasympathetic and sympathetic fibers.
The submandibular ganglion is suspended by two nerve filaments from the lingual nerve.
The lingual nerve lies at first beneath the lateral pterygoid muscle, medial to and in front of the inferior alveolar nerve, and is occasionally joined to this nerve by a branch which may cross the internal maxillary artery.
The chorda tympani (a branch of the facial nerve, CN VII) joins it at an acute angle here, carrying taste fibers from the anterior two thirds of the tongue and parasympathetic fibers to the submandibular ganglion.
The nerve then passes between the medial pterygoid muscle and the ramus of the mandible, and crosses obliquely to the side of the tongue over the constrictor pharyngis superior and styloglossus, and then between the hyoglossus and deep part of the submandibular gland; it finally runs from laterally to medially inferiorly crossing the duct of the submandibular gland, and along the tongue to its tip becoming the sublingual nerve, lying immediately beneath the mucous membrane.
Lingual nerve injuries
Dental procedures and in particular the administration of local anaesthetic can cause damage to the lingual nerve leading to lingual nerve neuropathy.
- SUNY Figs 27:03-05
- MedEd at Loyola GrossAnatomy/h_n/cn/cn1/cnb3.htm
- lesson4 at The Anatomy Lesson by Wesley Norman (Georgetown University) (mandibularnerve)
- cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (V)
- Anatomy diagram: 05287.011-1 at Roche Lexicon - illustrated navigator, Elsevier