Related Experiment Video
Updated: Jul 29, 2026
04:41
Whole Vitreous Humor Dissection for Vitreodynamic Analysis
Published on: May 24, 2015
Formation of the aqueous humor
A D Macknight1, C W McLaughlin, D Peart
1Department of Physiology, University of Otago Medical School, Dunedin, New Zealand. tony.macknight@stonebow.otago.ac.nz
Clinical and Experimental Pharmacology & Physiology
|March 4, 2000
Summary
Researchers studied ciliary epithelial cell composition to understand aqueous humor secretion in glaucoma. Findings suggest the Na+/K+/2Cl- cotransporter plays a key role in this fluid production, offering new insights into glaucoma disease mechanisms.
Area of Science:
- Ophthalmology
- Cell Biology
- Physiology
Background:
- Glaucoma is a leading cause of blindness, affecting 1-2% of individuals over 35.
- Increased intraocular pressure in glaucoma stems from an imbalance in aqueous humor production and drainage.
- Understanding ciliary epithelial cell composition is crucial for elucidating aqueous humor secretion mechanisms.
Purpose of the Study:
- To determine the composition of mammalian ciliary epithelial cells.
- To investigate the mechanisms of aqueous humor secretion.
- To propose a new model for fluid secretion in the eye.
Main Methods:
- Utilized electron-probe X-ray microanalysis.
- Analyzed ciliary epithelial cell composition under various in vitro conditions.
Main Results:
- Determined the elemental composition of ciliary epithelial cells.
- Identified key factors influencing fluid secretion.
- Proposed a novel model for aqueous humor secretion.
Conclusions:
- The Na+/K+/2Cl- cotransporter is highlighted for its potential secretory role.
- This research provides a new perspective on glaucoma pathophysiology.
- Further investigation into the Na+/K+/2Cl- cotransporter's function in glaucoma is warranted.
Related Concept Videos
01:25Glaucoma: Overview
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
01:27Open Angle Glaucoma: Treatment
In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Drugs such as carbonic anhydrase inhibitors, α2- and...
01:28Angle Closure Glaucoma: Treatment
Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
01:17Accessory Structures of the Eye
Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
01:20Anatomy of the Eyeball
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
01:23Formation of Concentrated Urine
There is a gradient of solutes in the interstitial fluid from the renal cortex through the medulla, known as the medullary osmotic gradient. The juxtamedullary nephrons establish and maintain this gradient using countercurrent mechanisms with loops extending deep into the medulla. These nephrons also use countercurrent mechanisms to regulate urine volume and concentration. The interaction between the descending and ascending limbs of the nephron loop creates an osmotic gradient through...