Greater petrosal nerve

The greater (superficial) petrosal nerve (also known as the large superficial petrosal nerve) is a nerve in the skull that branches from the facial nerve; it forms part of a chain of nerves that innervate the lacrimal gland. The fibers have synapses in the pterygopalatine ganglion (also known as the sphenopalatine ganglion).

Greater petrosal nerve
Alveolar branches of superior maxillary nerve and sphenopalatine ganglion.
Plan of the facial and intermediate nerves and their communication with other nerves.
Fromfacial nerve
Tonerve of pterygoid canal
Innervatesparasympathetics to lacrimal glands
Latinnervus petrosus major
Anatomical terms of neuroanatomy


Preganglionic parasympathetic fibres arise in the superior salivary nucleus of the pontine tegmentum. They join with general somatic sensory and special sensory fibres to form the nervus intermedius. The nervus intermedius exits the cranial cavity at the Internal auditory meatus, and joins with the motor root of the facial nerve at the geniculate ganglion. While preganglionic parasympathetic fibres pass through the geniculate ganglion, they neither synapse, nor have their cell bodies located there.

Preganglionic parasympathetic fibres exit the geniculate ganglion as the greater petrosal nerve. It enters the middle cranial fossa through the hiatus of the facial canal, along with the petrosal branch of the middle meningeal artery. It enters the pterygoid canal, where it joins the deep petrosal nerve (a sympathetic nerve) to form the nerve of the pterygoid canal, which passes through the pterygoid canal to reach the pterygopalatine ganglion.


The greater (superficial) petrosal nerve carries parasympathetic preganglionic fibers from the facial nerve. The greater petrosal nerve continues as the nerve of the pterygoid canal and ultimately synapses with the pterygopalatine ganglion whose parasympathetic postganglionic fibers synapse with the lacrimal gland and the mucosal glands of the nose, palate, and pharynx.

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