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The ciliary muscle /ˈsɪli.ɛəri/ is a ring of smooth muscle[2][3] in the eye's middle layer (vascular layer) that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle and dilator pupillae.

Ciliary muscle
More about ciliary muscles - NEET
The choroid and iris. (Ciliary muscle is labeled near top.)
Details
Origin1) longitudinal fibers → scleral spur; 2) circular fibers → encircle root of iris[1]
Insertion1) longitudinal fibers → ciliary process, 2) circular fibers → encircle root of iris[1]
Arterylong posterior ciliary arteries
VeinVorticose vein
Nerveshort ciliary
From oculomotor nerve
Through ciliary ganglionSympathetic postganglionic fibers from sup. cervical ganglia.
Actions1) accommodation, 2) regulation of trabecular meshwork pore sizes
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