The ciliary body is the part of the eye containing the ciliary muscle and ciliary processes. There are two sets of ciliary muscles in the eye. They are near the front of the eye, above and below the lens. They are attached to the lens by connective tissue called the zonule of Zinn, and are responsible for shaping the lens to focus light on the retina. (created with Sodipodi) Schematic diagram of the human eye Aqueous humour Anterior chamber Choroid Cornea Ciliary muscle Iris Lens Optic disc Fovea Optic nerve Posterior chamber Pupil Retina Sclera Suspensory ligament Vitreous humor Zonular fibers File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev... (created with Sodipodi) Schematic diagram of the human eye Aqueous humour Anterior chamber Choroid Cornea Ciliary muscle Iris Lens Optic disc Fovea Optic nerve Posterior chamber Pupil Retina Sclera Suspensory ligament Vitreous humor Zonular fibers File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev... This article or section is missing references or citation of sources. ... Grays FIG. 872- The choroid and iris. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... The zonule of Zinn is a ring of fibrous strands connecting the ciliary body with the crystalline lens of the eye. ... Human eye cross-sectional view. ...
When the ciliary muscle relaxes, it flattens the lens which generally improves the focus for farther objects. When it contracts, the lens becomes more convex which generally improves the focus for closer objects.
Pupil | Choroid | Tapetum lucidum | Ciliary body | Iris | Anterior chamber | Posterior chamber A top-down view of skeletal muscle Muscle is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... A lens. ... This article or section may be confusing for some readers, and should be edited to be clearer or more simplified. ... The visual system is the part of the nervous system which allows organisms to see. ... This article or section is missing references or citation of sources. ... The sclera is the white outer coating of the eye. ... Schlemms canal, also known as canal of Schlemm, is a circular channel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream . ... This is an area of tissue located around the base of the cornea, near the ciliary body, and is responsible for draining the aqueous humour from the eye via the anterior chamber (the chamber on the front of the eye covered by the cornea). ... The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eyes optical power . Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. ... The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids. ... The human eye The pupil is the central transparent area (showing as black). ... Schematic cross section of the human eye; choroid is shown in yellow. ... tapetum lucidum in a calf eye, with the retina hanging down The tapetum lucidum (Latin: bright carpet) is a reflecting layer immediately behind, and sometimes within, the retina of the eye of many vertebrates (though not humans); it serves to reflect light back to the retina, increasing the quantity of... The human iris The iris is the grey-brown area. ... The anterior chamber if the fluid-filled space inside the eye between the iris and the corneas innermost surface, the endothelium . ...
Retina | Macula | Optic fovea | Optic disc Human eye cross-sectional view. ... Human eye cross-sectional view. ... The fovea, a part of the eye, is a spot located in the center of the macula. ... The optic disc or optic nerve head is the point in the eye where the optic nerve fibres leave the retina; it is not sensitive to light and thus also known as the blind spot or anatomical blind spot. Inspection of the optic disc by ophthalmoscopy can give an indication...
Aqueous humour | Vitreous humour | Lens The aqueous humour is the clear, watery fluid that fills the complex space in the front of the eye which is bounded at the front by the cornea and at the rear by the front surface or face of the vitreous humour. ... Vitreous humour is the clear aqueous solution that fills the space between the lens and the retina of the vertebrate eyeball. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ...
It is traditionally divided into 3 or 4 regions, the iris, ciliarybody, pars plana and choroid.
For clinical use, the terms anterior uvea (ie, iris and ciliarybody) and posterior uvea (ie, choroid) are now in common use, since diseases often spread beyond a single anatomical region of the uvea.
Uveal vessels directly perfuse the ciliarybody and iris, to support their metabolic needs, and indirectly supply diffusible nutrients to the outer retina, cornea and lens, which lack any intrinsic blood supply.
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