Following a penetrated injury in the submandibular triangle, the tongue of 45 year old patient detes to the left on protrusion. Which of the following nerves is injured?
Right lingual nerve
Left lingual nerve
Right hypoglossal nerve
Left hypoglossal nerve
A lesion of the hypoglossal nerve causes detion of the tongue toward the injured side on protrusion. The lingual and glossopharyngeal nerves do not supply the tongue muscles. Hence option 4 i.e. left hypoglossal nerve (same as the side of detion) is correct.
Neck Triangles and parotid gland