Ciliary muscles


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Related to Ciliary muscles: retina, musculus ciliaris

Ciliary muscles

The small muscles that permit the lens to change its shape in order to focus on near or distant objects.
Mentioned in: Presbyopia
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Chronologically, the pigmented and nonpigmented ciliary epithelial tissue develop first, followed by the ciliary processes and zonules, and finally the pars plana, ciliary body stroma, and ciliary muscles. (4) This sequence supports the absence of any affected tissue other than the defective ciliary pigment layer in our case.
[9,10] One possible mechanism of eye elongation during accommodation can be attributed to ciliary muscle contraction leading to forward traction on choroid.
Mechanism of headache from ciliary muscles contraction in hypermetropia of equal or different degrees where patients accommodate to see clearly and in astigmatism, especially of low degree or moderate degree, where muscles contract irregularly may cause more severe headache.
However, it is accepted that loss of elasticity of the crystalline lens and loss of power of the ciliary muscles (the muscles which bend and straighten the lens) are involved.
Adaptation of the eye for near vision work is accomplished by accommodation; the increase curvature of the lens through movement of the ciliary muscles. An accommodative lag occurs when it takes longer for the eye to change fixation from one point to another.
In the human body, in which organ are the ciliary muscles situated: the eye or the liver?
Given the observed blood flow improvement measured in the retinal capillary vessels, it is likely that more blood reaches the ciliary body and provides nourishment to the ciliary muscles.