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| Ciliary muscles | ||
|---|---|---|
| The choroid and iris. (Ciliary muscle is labeled near top.) | ||
| Latin | musculus ciliaris | |
| Gray's | subject #225 1011 | |
| System | ||
| MeSH | [1] | |
| [[Image:|190px|center|]] | ||
The ciliary muscle is a smooth muscle that affects zonular fibers in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing. When the ciliary muscle contracts, it releases the tension on the lens caused by the zonular fibers (fibers that hold or flatten the lens). The release of tension of the zonular fibers causes the lens to become more spherical. Therefore, relaxation of the ciliary muscle causes the zonular fibers to become taught, flattening the lens, increasing long range focus.
Innervation[]
Contraction of the lens happens when there is parasympathetic activation of the M3 muscarinic receptors on the ciliary muscles (contraction of the ciliary muscles reduces the size of the ciliary body, lessening the tension on the lens and allowing it to assume a more sperical shape for close vision).
Unlike the muscles of the iris (which receives both types of autonomic innervation), the ciliary muscle receives only parasympathetic innervation. totally
See also[]
Additional images[]
External links[]
| Muscles of head and neck: the head |
| scalp/eyelid: occipitofrontalis (occipitalis, frontalis) - orbicularis oculi - corrugator supercilii - depressor supercilii
extraocular: levator palpebrae superioris - superior tarsal - rectus (superior, inferior, medial, lateral) - oblique (superior, inferior) - intraocular: ciliary - iris dilator - iris sphincter ear: auriculares - temporoparietalis - stapedius - tensor tympani nose: procerus - nasalis (dilatator naris) - depressor septi nasi - levator labii superioris alaeque nasi mouth: levator anguli oris/depressor anguli oris - levator labii superioris/depressor labii inferioris - zygomaticus (major, minor) - mentalis - buccinator - orbicularis oris - risorius mastication: masseter - temporalis - pterygoid (lateral, medial) tongue: extrinsic (genioglossus - hyoglossus - chondroglossus - styloglossus) intrinsic (superior longitudinal - inferior longitudinal - transversus - verticalis) soft palate: levator veli palatini - tensor veli palatini - musculus uvulae - palatoglossus - palatopharyngeus pharynx: pharyngeal constrictor (inferior, middle, superior) - stylopharyngeus - salpingopharyngeus larynx: cricothyroid - posterior cricoarytenoid - lateral cricoarytenoid - arytenoid - thyroarytenoid |
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- hu:Musculus ciliaris
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