| Ciliary ganglion | |
|---|---|
 | |
 Detailed view of nerves of lateral orbit showing the ciliary ganglion immediately behind the globe of the eye. | |
| Details | |
| From | Sensory root of ciliary ganglion
sympathetic root of ciliary ganglion parasympathetic root of ciliary ganglion |
| To | Short ciliary nerves |
| Identifiers | |
| Latin | ganglion ciliare |
| TA98 | A14.3.02.003 |
| TA2 | 6663 |
| FMA | 6964 |
| Anatomical terms of neuroanatomy | |
The ciliary ganglion is a parasympathetic ganglion located just behind the eye in the posterior orbit. It is 1–2 mm in diameter and in humans contains approximately 2,500 neurons.[1] The ganglion contains postganglionic parasympathetic neurons. These neurons supply the pupillary sphincter muscle, which constricts the pupil, and the ciliary muscle which contracts to make the lens more convex. Both of these muscles are involuntary since they are controlled by the parasympathetic division of the autonomic nervous system.
The ciliary ganglion is one of four parasympathetic ganglia of the head. The others are the submandibular ganglion, pterygopalatine ganglion, and otic ganglion.