Ciliary body

The ciliary body is the most anterior part of the vascular layer of the eyeball. Located in the pre-equatorial segment of the eyeball between the base of the iris and the ora serrata. It is composed of a highly vascularized connective tissue rich in melanocytes.

It has two distinct rings:

• The corona ciliaris is the central portion, composed of the ciliary processes.

• The orbiculus ciliaris is the peripheral, flatter portion.

The ciliary body is involved in lens accommodation, serving as a point of attachment for the ciliary zonule and through the action of the ciliary muscle fibers that run through it.

The aqueous humor that fills the anterior and posterior chambers is produced by the ciliary part of the retina covering the ciliary body.

The border of the ciliary body is asymmetrically shaped in most domestic animals, with a thin ventral part and virtually no medial part. Dogs and humans are the exception, with a circular, homogeneous perimeter.