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Parasympathetic Ganglia of the Head

Ganglia parasympathica

For medical students2 min readUpdated 2026-10-10

Parasympathetic ganglia of the head are vital autonomic centers that regulate glands and smooth muscle in the facial region. They receive signals from specific cranial nerves and relay them directly to target organs, such as the salivary glands, lacrimal gland, and intrinsic eye muscles.

Ciliary ganglionControls pupil size and lens curvature via the oculomotor nerve
LacrimationPterygopalatine ganglion supplies the lacrimal gland and mucous membranes
SalivationOtic, submandibular, and sublingual ganglia innervate the salivary glands

Ciliary Ganglion (*ganglion ciliare*)

This ganglion is a key element in the autonomic regulation of the eyeball. Anatomically and functionally, it is closely associated with the oculomotor nerve (CN III).

Three main roots contribute to the formation of the ganglion, each carrying a specific fiber type:

Postganglionic fibers emerge from the ganglion as short ciliary nerves (nn. ciliares breves). Their primary function is to innervate the intrinsic smooth muscles of the eye, specifically the sphincter pupillae muscle (m. sphincter pupillae) and the ciliary muscle (m. ciliaris), which is responsible for accommodation.

Pterygopalatine Ganglion (*ganglion pterygopalatinum*)

This ganglion is responsible for the secretory innervation of a significant portion of the facial cranium glands. It receives parasympathetic fibers from the facial nerve (CN VII). Notably, this connection is indirect—relayed via the greater petrosal nerve (n. petrosus major).

The distribution area of the pterygopalatine ganglion is quite extensive. Postganglionic fibers project to the following structures:

Thus, this ganglion plays a critical role in moistening the upper respiratory mucosa and protecting the ocular surface.

Submandibular and Sublingual Ganglia

These two ganglia work in close conjunction to innervate the salivary glands of the oral floor.

The submandibular ganglion (ganglion submandibulare) is functionally linked to the facial nerve (CN VII). Preganglionic fibers reach it via a specialized branch of the facial nerve—the chorda tympani (chorda tympani). Fibers from this ganglion project to two major glands:

  1. Submandibular salivary gland (glandula submandibularis).
  2. Sublingual salivary gland (glandula sublingualis).

The sublingual ganglion (ganglion sublinguale) is functionally coupled with the submandibular ganglion. Its postganglionic branches locally innervate the sublingual salivary gland itself, as well as numerous minor salivary glands located in the mucosa of the oral floor.

Otic Ganglion (*ganglion oticum*)

The otic ganglion is the center for secretory innervation of the largest salivary gland. Unlike the preceding ganglia, it receives parasympathetic fibers not from the facial nerve, but from the glossopharyngeal nerve (CN IX).

The sole, yet vital, target for postganglionic fibers from the otic ganglion is the parotid gland (glandula parotis). Impulses passing through this ganglion drive the secretion of watery, protein-rich saliva during digestion.

Frequently asked questions

Where is the ciliary ganglion located topographically?

The ciliary ganglion (ganglion ciliare) is topographically located within the orbit. In this region, parasympathetic preganglionic fibers separate from the oculomotor nerve (n. oculomotorius) and reach the ganglion to synapse with its neurons. After synapsing, short postganglionic fibers leave the ciliary ganglion and enter the eyeball directly to innervate the internal eye muscles (the sphincter pupillae and ciliary muscle).

In which anatomical structure is the pterygopalatine ganglion located?

The pterygopalatine ganglion (ganglion pterygopalatinum) is located in the pterygopalatine fossa (fossa pterygopalatina). This anatomical space also transmits the maxillary nerve as it enters via the foramen rotundum. Within the fossa, pterygopalatine nerves branch off the inferior surface of the maxillary nerve to reach the ganglion.

Which specific nerve branches arise from the pterygopalatine ganglion?

The pterygopalatine ganglion gives off branches carrying secretory and sensory fibers. These include:

  • Orbital branches (rami orbitales) — innervate the mucosa of the posterior ethmoidal air cells and sphenoid sinus.
  • Greater palatine nerve (n. palatinus major) — runs to the hard palate and palatine gingiva.
  • Lesser palatine nerves (nn. palatini minores) — course to the soft palate and uvula.
  • Posterior superior nasal branches (rr. nasales posteriores superiores) — innervate the nasal cavity mucosa.
  • Nasopalatine nerve (n. nasopalatinus) — passes through the incisive canal to the nasal septum mucosa and gingiva.
Through which nerve do preganglionic fibers directly reach the otic ganglion?

Preganglionic parasympathetic fibers directly approach the otic ganglion (ganglion oticum) via the lesser petrosal nerve (n. petrosus minor). This nerve serves as the parasympathetic root of the ganglion and is a direct continuation of the tympanic nerve (n. tympanicus), which originates from the glossopharyngeal nerve (CN IX). Within the otic ganglion, these fibers synapse, and postganglionic secretory fibers continue onward to the parotid gland.

Which nerve is associated with the ciliary ganglion?

The ciliary ganglion is connected to the oculomotor nerve (CN III) via its parasympathetic root (radix oculomotoria).

Which muscles are innervated by the short ciliary nerves?

They innervate the sphincter pupillae muscle (m. sphincter pupillae) and the ciliary muscle (m. ciliaris).

Which nerve delivers preganglionic fibers to the pterygopalatine ganglion?

Fibers originate from the facial nerve (CN VII) via the greater petrosal nerve (n. petrosus major).

Which gland is innervated by the otic ganglion?

The otic ganglion innervates the parotid gland (glandula parotis), with preganglionic fibers originating from the glossopharyngeal nerve.

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