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The ciliary muscles are sphincter muscle that controls the thickness of the lens. Each eye has a ciliary muscle around the lens of the eye. When the muscle contracts the lens gets compressed, and therefore thicker, meaning that it refracts light more (and shortens the focal distance). When it relaxes the reverse is true.
They are innervated by parasympathetic fibres originating in the occulomotor nucelus of the midbrain which travel (along with somatic fibres to the extrinsic muscles of the eye) along the occulomotor nerve (cranial nerve III). okkk
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoBe sure not to confuse the roles of the ciliary muscles and pupillary muscles; this is a mistake that even the experts make at times. The ciliary muscles do not control the size of the pupils - this is the job of the sphincter pupillae and dilator pupillae.
The ciliary muscles adjust the shape of the lenses in order to focus the eyes. They are attached to the zonules of Zinn, which are in turn attached to the lenses. Contraction of the ciliary muscles slackens the zonules so they don't pull so much on the lenses. The lenses become rounder, and the eyes can focus on a nearby object. When the ciliary muscles relax, the zonules pull the edges of the lenses so they become flatter and thinner for distance vision.
This is the basic mechanism of accomodation. There is some disagreement regarding the details - look up Helmholtz and Schachar if you are interested.
Wiki User
∙ 15y agoAccomodation reflex. The process increases the convexitivity of the lens due to contraction of the ciliary muscle and relaxation of the suspensory ligament.
Its done to maintain a distinct retinal image.
Wiki User
∙ 13y agoThe ciliary muscles flatten or allow the rounding of the lens of the eye. The shape of the lens moves the focal point of vision or "accomodates" the need to view objects at close hand or at distance.
Wiki User
∙ 11y agoThe eye lens is kept in place by ciliary muscles. These muscles can contract or relax.If the ciliary muscles contract or relax the focal length of the eye lens becomes large or small.
Or in other words the function of the eye lens is to increase or decrease the focal length of the eye lens.
Wiki User
∙ 13y agoOne of the muscles that relax the zonules to enable the lens to change shape for focusing.
Sarah Robles
Wiki User
∙ 11y agoaround the lens
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Contains the ciliary muscle of the eye?
ciliary body
Which eye muscles are responsible for accommodation?
The ciliary muscle as well as the ciliary body.
Smooth muscle stuctures in the eye?
Ciliary muscles
What medication paralyzes the ciliary muscle of the eye?
mydriacyl
Is the ciliary muscle part of the ciliary body?
the ciliary muscle is the smooth muscle of the ciliary body
What muscle controls the shape of the lens?
the lens is held vertically in the eye's interior by suspensory ligaments or more specifically called the ciliary zonule, attached to the ciliary body. so suspensory ligaments is the answer(-:
When the eye is looking at objects far in distance the lens is rounded and the ciliary muscle is contracted?
The ciliary muscle is relaxed when you look at something that is far away.
When the eye is looking at objects far in the distance the lens is and the ciliary muscle is?
TRUE
What topical cycloplegic for?
to paralyse ciliary muscle of the eye, resulting in loss of accommodation.
Where is the proprioceptor located?
articular capsules of synovial joints and ciliary muscle of eye and tendons .
What are the intrinsic eye muscles controlled by?
The iris and the ciliary muscle
What is the smooth muscle structure that is attached to the lens?
iris and ciliary muscle
