After submandibular gland excision, a patient notices loss of general sensation over the anterior two-thirds of the tongue on the operated side. Which structure, if injured, best explains this deficit?
- A Hypoglossal nerve
- B Lingual nerve where it is suspended below the submandibular ganglion ✓
- C Marginal mandibular branch of the facial nerve
- D Glossopharyngeal nerve
Correct answer: B. Lingual nerve where it is suspended below the submandibular ganglion
Explanation
The lingual nerve is tethered in the floor of the mouth by the submandibular ganglion hanging from it, so it lies directly on the deep surface of the gland and is at risk during dissection of the gland's deep part. Injury causes ipsilateral loss of general sensation and taste from the anterior two-thirds of the tongue. Hypoglossal injury causes tongue weakness and deviation, not sensory loss, which kills distractor A.
Reference: Gray's Anatomy for Surgeons, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.