Long root of the ciliary ganglion

Long root of the ciliary ganglion

The long root of the ciliary ganglion is a branch of the ophthalmic nerve that plays a crucial role in the human visual system. It is a part of the autonomic nervous system, specifically the parasympathetic division, and is responsible for the innervation of the ciliary muscle and the sphincter pupillae muscle.

Anatomy

The long root of the ciliary ganglion originates from the nasociliary nerve, a branch of the ophthalmic nerve. It then travels to the ciliary ganglion, a small parasympathetic ganglion located in the orbit behind the eye.

The long root of the ciliary ganglion (shown in red) originates from the nasociliary nerve and travels to the ciliary ganglion.

Function

The long root of the ciliary ganglion carries parasympathetic fibers that are responsible for the contraction of the ciliary muscle and the sphincter pupillae muscle. The ciliary muscle controls the shape of the lens, allowing the eye to focus on objects at different distances. The sphincter pupillae muscle controls the size of the pupil, regulating the amount of light that enters the eye.

Clinical significance

Damage to the long root of the ciliary ganglion can result in a number of visual disturbances, including blurred vision, double vision, and photophobia. It can also lead to Adie's pupil, a condition characterized by a dilated pupil that reacts slowly to light.

See also

• Short ciliary nerves
• Ciliary ganglion
• Ophthalmic nerve
• Nasociliary nerve