Lamina cribrosa en fondo de ojo pdf

This meshlike structure allows the ganglion cells forming the optic nerve to pass through the scleral wall. The lamina cribrosa lc is believed to be the site of injury to retinal ganglion cell axons in glaucoma. Lamina cribrosa definition of lamina cribrosa by medical. Where the optic nerve passes through the sclera, the latter forms a thin cribriform lamina, the lamina cribrosa scler the minute orifices in this lamina serve for the transmission of the nervous filaments, and the fibrous septa dividing them from one another are continuous with the membranous processes which separate the bundles of nerve fibers. These lamina cribrosa changes are associated with disk hemorrhages and visual field damage, and are detectable with clinical. Cribriform plate the horizontal bone plate perforated with several holes for the passage of olfactory nerve filaments from the nasal cavity. The lamina cribrosa is the putative site of retinal ganglion cell axonal injury in glaucoma. It is formed by a multilayered network of collagen fibers that insert into the scleral canal wall. Lamina cribrosa medical definition merriamwebster medical. D the ssoct sectioned volume image oriented by white line in a. Changes in lamina cribrosa morphology in glaucoma include posteriorization of the laminar insertion into the sclera, increased cupping or depth of the lamina cribrosa, and the development of focal lamina cribrosa defects.

Retinal vein occlusion cribriform plate this is a part. The blood vessels of the sclera are largely confined to a superficial layer of tissue, and these, along with the conjunctival vessels, are responsible for the bright redness of the inflamed eye. The role of the lamina cribrosa in the pathogenesis of glaucoma. Cribriform plate of the ethmoid bone horizontal lamina or lamina cribrosa ossis ethmoidalis. The nerve fibers forming the optic nerve exit the eye posteriorly through a hole in the sclera that is occupied by a meshlike structure called the lamina cribrosa. This region is called the lamina cribrosa figure 1. While for many years the research on the lc was essentially dependent on. Lamina cribrosa synonyms, lamina cribrosa pronunciation, lamina cribrosa translation, english dictionary definition of lamina cribrosa. The lamina cribrosa lc is believed to be the site of.

Recent advances in optical coherence tomography, including enhanced depth and swept. Lamina cribosa definition of lamina cribosa by medical. This patient has a deep optic nerve head cup and prominent inferotemporal notch secondary to optic nerve damage from primary open angle glaucoma. High resolution in vivo imaging of the lamina cribrosa. The lamina cribrosa is thought to help maintain the pressure gradient between the inside of the eye and the surrounding tissue. Recent advances in oct imaging of the lamina cribrosa.

The lc defects are shown by green arrowheads as hypore. Oftalmoscopio frente al ojo dominante y 2030cm del explorado. Lamina cribrosa sclerae, a meshlike structures which allows nerve fibres of the optic nerve to pass through the sclera. Within the scleral portion of the canal, the bundled axons pass through the lamina cribrosa, a meshwork of astrocytecovered, capillary. Sigal from the ocular biomechanics laboratory of the devers eye institute, legacy health, 1225 ne 2nd ave. Lamina cribrosa definition of lamina cribrosa by the free.

Cindy montague click image above to see high resolution this patient has a deep optic nerve head cup and prominent inferotemporal notch secondary to optic nerve damage from primary open angle glaucoma. Although histological studies have provided evidence of structural changes to the lamina cribrosa, even. E cosi chiamata in quanto riccamente costellata di fori attraverso i quali passano le terminazioni nervose amieliniche del nervo olfattivo i paio di nervi cranici. The lamina cribrosa lc is a meshlike structure in the scleral canal of the optic nerve head composed of overlapping and branching collagenous beams wilczek, 1947. The ability to visualise this structure has the potential to help increase our understanding of the disease and be useful in the early detection of glaucoma. Lamina cribrosa of sclera lamina cribrosa sclerae imaios. The deep cup reveals the lamina cribrosa, a fenestrated region composed of connective tissue and elastic fibers. The lc has been implicated as the principal site of rgc axonal injury in. Libro nuevo o segunda mano, sinopsis, resumen y opiniones. Being structurally weaker than the much thicker and denser sclera, the lamina cribrosa is more sensitive to changes in the intraocular pressure and tends to react to increased pressure through posterior displacement.