What are the zonules of the eye?
Ciliary zonules are a ring of fibrous structures anchoring the ciliary body with the lens of the eye. These are the structures that help to maintain the position of the lens in the optical path, and anchor muscles that change the shape of the lens to alter focus.
What is the meaning of zonules?
a small zone, band
/ (ˈzɒnjuːl) / noun. a small zone, band, or area.
Where do zonules attach to lens?
The zonules attach to the lens capsule 2 mm anterior and 1 mm posterior to the equator, and arise of the ciliary epithelium from the pars plana region as well as from the valleys between the ciliary processes in the pars plicata.
Are zonules muscles?
The zonules of Zinn are a circumferential system of fibrous strands connecting the lens to the ciliary body. The tension exerted by the zonules on the lens is modulated by the contraction or relaxation of the ciliary muscle.
What is the function of the zonules?
The Zonule of Zinn, or ciliary zonule, is the elaborate system of extracellular fibers that centers the lens in the eye. In humans, the fibers transmit forces that flatten the lens during the process of disaccommodation, thereby bringing distant objects into focus.
What are ciliary zonules?
The zonule, often referred to as the ciliary zonule, is the circumferential suspensory ligament that connects the lens of the eye to the ciliary body. The zonule is composed of an elaborate system of fibers that spans the gap between the lens and the adjacent nonpigmented ciliary epithelium (NPCE).
What do Zonular fibers do?
In primate eyes, the zonular fibers play a key role in accommodation. They transmit the forces that flatten the lens, allowing the eye to focus on distant objects.
What are zonules made of?
The zonule is composed of an elaborate system of fibers that spans the gap between the lens and the adjacent nonpigmented ciliary epithelium (NPCE). This fibrous rigging ensures lens centration.
What is subluxation of lens?
In lens subluxation, zonular fibers are broken, and the lens is no longer held securely in place but remains in the pupillary aperture. Lens dislocation occurs following complete disruption of the zonular fibers and displacement of the lens from the pupil. Trauma is the leading cause of lens dislocation.
WHAT IS lens subluxation?
What is subluxated cataract?
The patient is looking down. With the slit-lamp, the superior equator of the lens is at the margin of the pupil at 12 o’clock. The subluxated (partially dislocated) lens is heading towards a luxation (dislocation) into the floor of the vitreous chamber.
What does zonule mean in anatomy?
[zōn´ūl] a small zone. ciliary zonule (zonule of Zinn) a series of fibers connecting the ciliary body and lens of the eye, holding the lens in place.
What is the zonule of Zinn?
ciliary zonule (zonule of Zinn) a series of fibers connecting the ciliary body and lens of the eye, holding the lens in place. Ciliary zonule.
What does it mean when the lens zonules are weak?
According to the pamphlet, “The abnormal protein seen in this condition settles and weakens the lens zonules, which are suspensory fibers that hold the lens in place. The ciliary body has three functions: accommodation, aqueous humor production and maintenance of the lens zonules.
What is the function of the ciliary zonule?
ciliary zonule (zonule of Zinn) a series of fibers connecting the ciliary body and lens of the eye, holding the lens in place.