Nerve and Blood Supply of Ciliary Body

 The ciliary body is a ring-shaped muscular structure located between the iris and the choroid in the eye. It plays a crucial role in the maintenance of the eye's refractive power and the drainage of aqueous humor. The ciliary body is supplied by several nerves and blood vessels that are essential for its proper functioning.

Nerve Supply

The ciliary body receives its nerve supply from the oculomotor nerve (CN III), the sympathetic nerves, and the parasympathetic nerves.

The oculomotor nerve (CN III) is responsible for the innervation of the ciliary muscle, which controls the shape of the lens and the accommodation of the eye.

The sympathetic nerves originate from the superior cervical ganglion and supply the dilator muscle of the iris, responsible for the dilation of the pupil.

The parasympathetic nerves originate from the Edinger-Westphal nucleus and supply the sphincter muscle of the iris, responsible for the constriction of the pupil.

Blood Supply

The ciliary body receives its blood supply from the short posterior ciliary arteries and the long posterior ciliary artery. These vessels branch off from the ophthalmic artery, which is the first branch of the internal carotid artery.

The short posterior ciliary arteries supply the anterior part of the ciliary body, while the long posterior ciliary artery supplies the posterior part of the ciliary body.

The ciliary body also receives blood supply from the choroidal vessels, which are located in the choroid, the layer of the eye that lies between the retina and the sclera.

In summary, the ciliary body is supplied by a complex network of nerves and blood vessels that are essential for its proper functioning. The oculomotor nerve, sympathetic nerves, and parasympathetic nerves innervate the ciliary muscle, dilator muscle of the iris, and sphincter muscle of the iris respectively. The short and long posterior ciliary arteries supply the blood to the ciliary body and choroidal vessels supply it to the choroid.

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