Nerve of pterygoid canal

The nerve of the pterygoid canal forms from the junction of the greater petrosal nerve and the lesser petrosal nerve within the foreamen lacerum. This combined nerve exits the foramen lacerum and travels to the pterygopalatine fossa through the pterygoid canal in the sphenoid.

The nerve of the pterygoid canal contains axons of both sympathetic and parasympathetic axons, specifically;

• preganglonic parasympathetic axons from the greater petrosal nerve, a branch of the facial nerve (cell bodies are located in the superior salivatory nucleus)
• postganglionic sympathetic axons from the deep petrosal nerve, a branch of the internal carotid plexus (cell bodies are located in the superior cervical ganglion)

The preganglionic parasympathetic axons synapse in the pterygopalatine ganglion, which contains the postganglionic neurons which provide secretomotor innervation to the lacrimal gland, as well as the nasal and palatine glands.

The postganglionic sympathetic axons do not synapse in the pterygopalatine ganglion, they travel on the branches of the maxillary nerve to provide sympathetic innervation to blood vessels.

• 
  Alveolar branches of superior maxillary nerve and pterygopalatine ganglion.
• 
  Diagram of the cervical sympathetic.

• Vidus Vidius

This article incorporates text in the public domain from page 892 of the 20th edition of Gray's Anatomy (1918)

• cranialnerves at The Anatomy Lesson by Wesley Norman (Georgetown University) (VII) ("NPC")