What passes through the lamina cribrosa?
What passes through the lamina cribrosa?
Lamina cribrosa sclerae, a mesh-like structures which allows nerve fibres of the optic nerve to pass through the sclera.
What causes lamina cribrosa?
The reason for the exposure of the posterior surface of the lamina cribrosa to the pia mater (and indirectly to the cerebrospinal fluid space) is that, because of the pathologic process in glaucoma, the optic nerve volume inside the pia mater shrinks, decreasing the diameter of the optic nerve within the pia mater.
What is RNFL and GCC?
The macular ganglion cell complex (GCC), available in commercial Fourier-domain optical coherence tomography, allows the quantification of the innermost retinal layers that are potentially involved in the glaucomatous damage, including the retinal nerve fiber (RNFL), ganglion cell and inner plexiform layers.
Is the optic disc nasal or temporal?
The optic disc is placed 3 to 4 mm to the nasal side of the fovea. It is a vertical oval, with average dimensions of 1.76mm horizontally by 1.92mm vertically. There is a central depression, of variable size, called the optic cup.
What structure is called the lamina cribrosa?
The lamina cribrosa sclerae, also known as lamina cribrosa of the sclera, is a net-like structure covering a small hole in the posterior sclera through which the optic nerve (cranial nerve II), central retinal artery and central retinal vein pass.
Is the lamina cribrosa bone?
The cribriform plate (less commonly also called the lamina cribrosa of the ethmoid bone) is a sieve-like structure between the anterior cranial fossa and the nasal cavity. It is a part of ethmoid bone and supports the olfactory bulb, which lies in the olfactory fossa.
Where is the area Cribrosa located?
A horizontal cross section of the human eye, showing the major parts of the eye, including the protective covering of the cornea over the front of the eye.
What is normal GCC thickness?
Depending on the OCT used, average GCC thickness is approximately 95 to 100 microns. Progression analysis software allows comparison of baseline and follow-up scans to determine if there has been any progressive thinning of the GCC.
What is temporal of the macula?
The macula is the central region of the retina situated at the posterior pole of the eye, between the superior and inferior temporal arteries, 3 mm lateral (temporal) to the optic disc.
Is the macula temporal to optic nerve?
The macula is the central 3 mm of the retina. It has intense pigment supplied by the retinal pigment epithelium. The fovea is the central part of the macula. It is located 3-3.5 mm temporal to the temporal edge of the optic nerve head.