Lesser palatine nerves

Last revised by Jordan Southi on 29 Jun 2024

The lesser palatine nerves (or posterior palatine nerves) are a group of 2 to 3 nerves (usually 2 nerves) that arise off the maxillary division of the trigeminal nerve and contributes to the pterygopalatine ganglion.

Gross anatomy

The lesser palatine nerves divide off the maxillary division just after emerging from the foramen rotundum to enter the pterygopalatine fossa. At the pterygopalatine ganglion the nerves receive parasympathetic fibers that supply palatine mucosal glands as well as special sensory fibers (taste) which arrive at the ganglia via the greater petrosal nerve.

They leave the fossa inferiorly through the lesser palatine canal, posterior to the greater palatine canal (although some authors describe the lesser palatine canal arising from the greater palatine canal). The nerves then emerge on the hard palate through the lesser palatine foramen behind the pyramidal process of the palatine bone. They supply the mucosa of the uvulasoft palate and palatine tonsil.

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