ciliary muscle


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cil·i·ar·y mus·cle

[TA]
the intrinsic smooth muscle of the ciliary body of eyeball; it consists of circular fibers [TA] (fibrae circulares [TA]), radial fibers [TA] (fibrae radialis [TA]), meridional fibers [TA] (fibrae meridionales [TA]), and longitudinal fibers [TA] (fibrae longitudinales [TA]); action, in contracting, its diameter is reduced (like a sphincter's), reducing tensile (stretching) forces on lens, allowing the lens to thicken for near vision (accommodation).

ciliary muscle

a semitransparent circular band of smooth muscle fibers attached to the choroid of the eye, the chief agent in glowing lens adjustment of the eye to assume a more spherical shape. It draws the ciliary process centripetally, relaxing the suspensory ligament of the crystalline lens and allowing the lens to become more convex.

cil·i·ar·y mus·cle

(sil'ē-ar-ē mŭs'ĕl) [TA]
The smooth muscle of the ciliary body; it consists of circular fibers (Müller muscle) and radiating fibers (meridional fibers, or Brücke muscle); action, in contracting, its diameter is reduced (like a sphincter), reducing tensile (stretching) forces on lens, allowing it to thicken for near vision (accommodation).
Synonym(s): musculus ciliaris [TA] .

ciliary muscle

any muscle contained within the CILIARY BODY surrounding the lens of the vertebrate eye. Through attachment to the lens they change its shape and bring about ACCOMMODATION (1).

Bowman,

Sir William, English ophthalmologist, anatomist, and physiologist, 1816-1892.
Bowman capsule - the expanded beginning of a nephron. Synonym(s): glomerular capsule
Bowman disk - disk resulting from transverse segmentation of striated muscular fiber treated with weak acids, certain alkaline solutions, or freezing.
Bowman eye knife
Bowman gland
Bowman iris needle
Bowman iris scissors
Bowman lacrimal dilator
Bowman lacrimal probe
Bowman membrane - Synonym(s): anterior limiting layer of cornea
Bowman muscle - Synonym(s): ciliary muscle
Bowman probe - a double-ended probe for the lacrimal duct.
Bowman space - the slitlike space between the visceral and parietal layers of the capsule of the renal corpuscle. Synonym(s): capsular space
Bowman strabismus scissors
Bowman theory - that urine is formed by passive filtration through the glomeruli and secretion by the epithelium of the tubules.

cil·i·ar·y mus·cle

(sil'ē-ar-ē mŭs'ĕl) [TA]
The smooth muscle of the ciliary body; action, in contracting, its diameter is reduced (like a sphincter), reducing tensile (stretching) forces on ocular lens, allowing it to thicken for near vision (accommodation).
Synonym(s): musculus ciliaris [TA] .

ciliary

pertaining to or resembling cilia; used particulary in reference to certain eye structures, such as the ciliary body or muscles.

ciliary adenomas
arise from the non-pigmented inner layer of the ciliary epithelium; cause hyphema or glaucoma.
ciliary body
the thickened part of the vascular tunic of the eye, connecting choroid and iris, made up of the ciliary muscle and the ciliary processes. The processes radiate from the ciliary muscle and give attachments to ligaments supporting the lens of the eye.
ciliary body inflammation
ciliary epithelium
rostral continuation of the pars ciliaris retinae; non-pigmented, non-neural cells.
ciliary flush
dilation of deep conjunctival vessels and episcleral vessels causing perilimbal redness.
ciliary glands
sweat glands which have become arrested in their development, situated at the edge of the eyelids. Called also Moll's glands.
ciliary inflammation
cyclitis.
ciliary injection
peripheral hyperemia of the anterior ciliary vessels which produces a deep red or rose color of the corneal stroma, and must be distinguished from hyperemia of the conjunctival vessels. May spread to the perilimbic corneal tissue. Called also ciliary flush.
ciliary muscle
the smooth (mammals) or striated (birds) muscle that forms the main part of the ciliary body and and functions in accommodation of the eye.
primary ciliary dyskinesia
abnormality of ciliary function leading to diseases of respiratory and reproductive tracts including sinusitis and bronchiectasis. May be associated with cardiac displacement. See also kartagener's syndrome.
ciliary process
folded structures on the posterior aspect of the ciliary body.
Enlarge picture
Anatomy of the ciliary processes. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000
ciliary reflex
movements of the pupil in accommodation.
ciliary zonules
continuations of the ciliary processes of the ciliary body connecting it to the lens. They are in close contact with the hyaloid membrane of the vitreous body.
References in periodicals archive ?
After adjustment for other factors, age was also related to a decrease in the diameter of the ring of ciliary muscles that change the shape of the lens in the process of accommodation.
Age-related changes in human ciliary muscle and lens: A magnetic resonance imaging study.
Chromium also aids in enhancing energy to the ciliary muscles necessary for eye focusing, which in turn relieves impetus for excessive eyeball elongation.
Compared with control subjects, those given 6 mg astaxanthin daily had improved blood flow to the small blood vessels in the retina, which is a specialized layer that transmits visual information reaching the back of the eye, and potentially to the ciliary muscle.
The FocusIOL and FlexOptic lenses are designed to mimic the qualities of the eye's natural crystalline lens by accommodating in response to changes in the eye's natural ciliary muscle mechanism.
Dr Marco Ruggeri, assistant professor at Bascom Palmer Eye Institute, explained: "Although it is accepted that changes in the optical and mechanical properties of the crystalline lens are central to the onset of presbyopia, little is known about the role of the ciliary muscle and how it may, or may not, affect the loss of accommodation with age.
Zonules are the small fibers that work in conjunction with the ciliary muscle to adjust the shape of the crystalline lens.
1,2,3) The ciliary muscle was discovered in the middle of the 19th century and in 1853, Hermann von Helmholtz, published "A Theory Of Accommodation.
Early in his research, Cumming noted that the ciliary muscle in the eye did not stop functioning in older patients.
AIOLs rely on the continued function of the ciliary muscle with advancing age and are designed to change their power in response to physiological changes occurring in the accommodative structures.
Anatomical and physiological mapping studies in primates suggest that neurons of the anteromedian nucleus are principally concerned with accommodation via connections with autonomic neurons of the ciliary ganglion whose post-ganglionic axons innervate the ciliary muscle, whereas the Edinger Westphal nuclei supply other ciliary ganglion cells mediating pupillary constriction.
Many studies have shown the ciliary muscle retains its functional ability in presbyopia, the loss of accommodation being due to increasing lens rigidity.