Human Trabecular Meshwork Cells (HTMC) are endothelial-like cells in a sponge-like connective tissue located near the front of the eye. In this area of high outflow resistance, HTMC regulate eye pressure by controlling drainage of fluid into tubes that flow into the bloodstream. Accordingly, what is the trabecular meshwork in the eye?
The trabecular meshwork is the spongy tissue located near the cornea through which aqueous humor flows out of the eye. If there is higher outflow resistance, then the eye pressure gradually increases.
Also Know, what is trabecular meshwork cells? Trabecular meshwork (TM) cells are the primary cell type that occupy and form the proximal portion of the conventional outflow pathway, the primary egress route for aqueous humor from the eye.
Also know, what is the function of trabecular meshwork?
The trabecular meshwork controls the IOP by regulating outflow of aqueous humor from the anterior chamber of the eye into the adjacent Schlemm's canal (SC) and then via aqueous vein collector channels into the venous system. Dysfunction of the trabecular meshwork is the cause of IOP elevation.
What is uveal meshwork?
the network of fibers (pectinate ligaments) at the iridocorneal angle between the anterior chamber of the eye and the venous sinus of the sclera; it contains spaces between the fibers that are involved in drainage of the aqueous humor and is composed of two portions: the corneoscleral part (the part attached to the
Related Question Answers
What blocks the trabecular meshwork?
Pigment dispersion, where tiny fragments or granules from the iris (the colored part of the eye) can circulate in the aqueous humor (the fluid within the front portion of the eye) and block the trabecular meshwork, the tiny drain for the eye's aqueous humor. Can glaucoma be cured?
In general, glaucoma cannot be cured, but it can be controlled. Eye drops, pills, laser procedures, and surgical operations are used to prevent or slow further damage from occurring. With any type of glaucoma, regular eye examinations are very important to detect progression and to prevent vision loss. Can you have narrow angles without glaucoma?
Patients with narrow angles can have different presentations, ranging from acute angle-closure attack to anatomical narrow angles without evidence of glaucoma, making management a challenge. What is Goniotomy?
Goniotomy is a surgical procedure in which the doctor uses a lens called a goniolens to see the structures of the front part of the eye (anterior chamber). An opening is made in the trabecular meshwork, the group of tiny canals located in the drainage angle, where fluid leaves the eye. How do they remove fluid from behind the eye?
Vitrectomy is a surgery to remove the vitreous gel from the middle of your eye. Vitreous gel (also called vitreous humour) is a thick, colourless, gel-like fluid that fills the large space in the middle of the eye, behind the lens. It helps the eyeball maintain its shape. What is the trabecular meshwork made of?
connective tissue
What is a trabecular?
Structure. Trabecular bone, also called cancellous bone, is porous bone composed of trabeculated bone tissue. It can be found at the ends of long bones like the femur, where the bone is actually not solid but is full of holes connected by thin rods and plates of bone tissue. What is Schlemm's canal?
Schlemm's canal (SC) is a unique vascular structure that functions to maintain fluid homeostasis by draining aqueous humor from the eye into the systemic circulation. What is trabecular bone?
Trabecular bone is a highly porous (typically 75–95%) form of bone tissue that is organized into a network of interconnected rods and plates called trabeculae which surround pores that are filled with bone marrow. What is Uveoscleral outflow?
The term uveoscleral outflow refers to the drainage of ocular aqueous humor from the anterior chamber into the anterior chamber angle other than through the trabecular meshwork (Figure). Unlike the trabecular outflow route, the uveoscleral outflow route is not a distinctive pathway with tubes and channels. What is the cause glaucoma?
Glaucoma is the result of damage to the optic nerve. As this nerve gradually deteriorates, blind spots develop in your visual field. For reasons that doctors don't fully understand, this nerve damage is usually related to increased pressure in the eye. How is aqueous humor drained?
Aqueous humor flows from the ciliary body into the anterior chamber, out through a spongy tissue at the front of the eye called the trabecular meshwork and into a drainage canal (dark blue region next to the trabecular meshwork). What is the Schwalbe's line?
Schwalbe's line is the anatomical line found on the interior surface of the eye's cornea, and delineates the outer limit of the corneal endothelium layer. Specifically, it represents the termination of Descemet's membrane. In many cases it can be seen via gonioscopy. How many types of glaucoma are there?
There are several types of glaucoma. The two main types are open-angle and angle-closure. These are marked by an increase of intraocular pressure (IOP), or pressure inside the eye. What is trabecular outflow?
The trabecular outflow pathway is the primary draining tissue for the aqueous humor in the eye. It consists of 3 structures, the trabecular meshwork (TM), juxtacanalicular tissue, and Schlemm's canal. In a healthy eye, IOP is maintained within a narrow range through dynamic regulation of trabecular outflow resistance. How do you read a Gonioscopy?
Interpreting Your Gonioscopy View We recommend always starting your gonioscopy by viewing the inferior angle. This is typically the widest angle and the easiest to identify structures due to the increased pigmentation. Remember that, with indirect gonioscopy, your mirror is 180° away from the angle you are viewing. What is the ciliary epithelium?
The ciliary epithelium of the ciliary processes produces aqueous humor, which is responsible for providing oxygen, nutrients, and metabolic waste removal to the lens and the cornea, which do not have their own blood supply. Which specialized structure is responsible for the IOP?
Trabecular meshwork (TM) is a specialized tissue responsible for draining most of the aqueous humor from the anterior chamber of the eye, thereby controlling the IOP. What does a Tonopen measure?
Tono-pen measurement of intraocular pressure under topical anaesthesia in full term normal newborns. What is intraocular pressure?
Intraocular pressure (IOP) is the fluid pressure of the eye. As pressure is a measure of force per area, IOP is a measurement involving the magnitude of the force exerted by the aqueous humor on the internal surface area of the anterior eye. What is congenital glaucoma?
Childhood glaucoma — also referred to as congenital glaucoma, pediatric, or infantile glaucoma — occurs in babies and young children. It is usually diagnosed within the first year of life. This is a rare condition that may be inherited, caused by incorrect development of the eye's drainage system before birth. What is cancellous bone?
Cancellous bone is the meshwork of spongy tissue (trabeculae) of mature adult bone typically found at the core of vertebral bones in the spine and the ends of the long bones (such as the femur or thigh bone). What is uvea of the eye?
The uvea is the middle layer of the eye. It lies beneath the white part of the eye (the sclera). It is made of the iris, ciliary body, and choroid. What is the normal intraocular pressure?
Eye pressure is measured in millimeters of mercury (mm Hg). Normal eye pressure ranges from 12-22 mm Hg, and eye pressure of greater than 22 mm Hg is considered higher than normal. When the IOP is higher than normal but the person does not show signs of glaucoma, this is referred to as ocular hypertension. Where is ciliary muscle?
The ciliary muscle is elongated, triangular in shape, and located beneath the anterior sclera just posterior to the limbus. The shortest side of the triangular region faces anterior-inward and it is to this region of the ciliary body that the base of the iris inserts. What is a Cyclodialysis cleft?
A cyclodialysis cleft is a separation of the ciliary body from the scleral spur, creating a direct connection between the anterior chamber and the suprachoroidal space.A cyclodialysis cleft is a separation of the ciliary body from the scleral spur, creating a direct connection between the anterior chamber and the suprachoroidal space. What is the ora serrata?
The ora serrata (plural: orae serratae) is the most anterior extent of the retina. This serrated transitional zone lies between the anterior margin of the retina and the ciliary bodies. What is angle recession?
Angle recession is a common manifestation of blunt ocular trauma and involves rupture of the ciliary body face, resulting in a tear between the longitudinal and circular fibers of the ciliary muscle. What is the cornea made of?
It consists primarily of water (78 percent) and collagen (16 percent), and does not contain any blood vessels. Collagen gives the cornea its strength, elasticity, and form. The collagen's unique shape, arrangement, and spacing are essential in producing the cornea's light-conducting transparency. What is angle structure?
The normal angle structures of an open angle, as shown in figure 1, are the iris, ciliary body band, scleral spur, trabecular meshwork and Schwalbes line (from posterior to anterior). The iris attaches to the ciliary body band in an open angle. What structure controls the size of the pupil?
The iris controls the size of the pupil in response to light outside the eye so that the proper amount of light is let into the eye. The lens is normally clear and is located behind the iris. Small muscles attached to the lens can change its shape. This allows the eye to focus on near or far objects. 
