Eye Anatomy - Frank`s Hospital Workshop
... sits behind the iris and is unique in that it doesn’t have any innervation or vascularization. It gets its nourishment entirely from nutrients floating in the aqueous fluid. The lens also has the highest protein concentration of any tissue in the body (65% water, 35% protein). Though the lens may lo ...
... sits behind the iris and is unique in that it doesn’t have any innervation or vascularization. It gets its nourishment entirely from nutrients floating in the aqueous fluid. The lens also has the highest protein concentration of any tissue in the body (65% water, 35% protein). Though the lens may lo ...
The Eye and Ear (model-based undergrad
... smooth muscles are present within the iris: sphincter pupillae and dilator pupillae. Note: the terms sphincter pupillae and constrictor pupillae are two names for the same structure. One smooth muscle is present within the ciliary body: the ciliary muscle. The dilator pupillae receives sympathetic i ...
... smooth muscles are present within the iris: sphincter pupillae and dilator pupillae. Note: the terms sphincter pupillae and constrictor pupillae are two names for the same structure. One smooth muscle is present within the ciliary body: the ciliary muscle. The dilator pupillae receives sympathetic i ...
Morgan, J.I.W., Dubra, A., Wolfe, R., Merigan, W.H., Williams, D.R.
... mal structure of the retina and for preserving normal photoreceptor function. Indeed, abnormal RPE cells contribute to disease mechanism and progression in numerous retinal diseases, including age-related macular degeneration, Stargardt’s dystrophy, Best’s disease, and others.1 Despite the important ...
... mal structure of the retina and for preserving normal photoreceptor function. Indeed, abnormal RPE cells contribute to disease mechanism and progression in numerous retinal diseases, including age-related macular degeneration, Stargardt’s dystrophy, Best’s disease, and others.1 Despite the important ...
Artificial Eye
... each has formidable preprocessing circuitry placed at a remote location from the central processing system (brain). Its primary task include transmitting images with a viewing angle of at least 140deg and resolution of 1 arc min over a limited capacity carrier, the million or so fibers in each optic ...
... each has formidable preprocessing circuitry placed at a remote location from the central processing system (brain). Its primary task include transmitting images with a viewing angle of at least 140deg and resolution of 1 arc min over a limited capacity carrier, the million or so fibers in each optic ...
Anatomy
... the amacrine and bipolar cells; (5) inner nuclear layer of bipolar, amacrine, and horizontal cell bodies; (6) outer plexiform layer, containing the connections of the bipolar and horizontal cells with the photoreceptors; (7) outer nuclear layer of photoreceptor cell nuclei; (8) external limiting mem ...
... the amacrine and bipolar cells; (5) inner nuclear layer of bipolar, amacrine, and horizontal cell bodies; (6) outer plexiform layer, containing the connections of the bipolar and horizontal cells with the photoreceptors; (7) outer nuclear layer of photoreceptor cell nuclei; (8) external limiting mem ...
Fact Sheet Leber’s Congenital Amaurosis (303) 866-6681 or (303) 866-6605
... How is LCA Diagnosed? LCA is usually diagnosed by an ophthalmologist, based on the history and the physical findings. An electroretinogram (ERG) is often utilized to test the function of the rods and cones of the retina and is performed with special equipment. Blood tests for genetic changes can ...
... How is LCA Diagnosed? LCA is usually diagnosed by an ophthalmologist, based on the history and the physical findings. An electroretinogram (ERG) is often utilized to test the function of the rods and cones of the retina and is performed with special equipment. Blood tests for genetic changes can ...
Lab 2 The Microscope
... The TEM resolving power is 1,000X greater than the LM, making it 1,000,000X better at resolving fine details than our naked human eyes. ...
... The TEM resolving power is 1,000X greater than the LM, making it 1,000,000X better at resolving fine details than our naked human eyes. ...
CASE V - Better ONE or two
... Chorioretinal venous anastomosis bypasses the site of venous occlusion in the optic disc, creating a venous outflow channel to choroidal circulation. Retinal veins are punctured, either using laser or by surgery, through the RPE and Bruch’s membrane into the choroid, developing anastomotic channels ...
... Chorioretinal venous anastomosis bypasses the site of venous occlusion in the optic disc, creating a venous outflow channel to choroidal circulation. Retinal veins are punctured, either using laser or by surgery, through the RPE and Bruch’s membrane into the choroid, developing anastomotic channels ...
Albinism - Oculocutaneous and Ocular
... Glasses can be prescribed for reduced visual acuity. The appearance of strabismus may be improved by surgery; but surgery will not correct the misrouting of nerves from the eyes to the brain, and will not provide fine binocular vision. Sunglasses or tinted contact lenses can be worn for light sensit ...
... Glasses can be prescribed for reduced visual acuity. The appearance of strabismus may be improved by surgery; but surgery will not correct the misrouting of nerves from the eyes to the brain, and will not provide fine binocular vision. Sunglasses or tinted contact lenses can be worn for light sensit ...
Eye infections POSA
... in bright light. The aperture itself is known as the pupil The lens helps to focus light on the retina. The macula is a small area in the retina that provides our most central, acute vision. The optic nerve conducts visual impulses to the brain from the retina. ...
... in bright light. The aperture itself is known as the pupil The lens helps to focus light on the retina. The macula is a small area in the retina that provides our most central, acute vision. The optic nerve conducts visual impulses to the brain from the retina. ...
Winter 2011 - Retina Consultants of Southwest Florida
... The News Press and the Naples Daily News. He was also a healthcare guest panelist for The News Press Recently, the Obama administration’s Secretary for Health and Human Services, Kathleen Sebelius, has been touting the benefits of the Obamacare legislation. She has been citing the fact that Blue C ...
... The News Press and the Naples Daily News. He was also a healthcare guest panelist for The News Press Recently, the Obama administration’s Secretary for Health and Human Services, Kathleen Sebelius, has been touting the benefits of the Obamacare legislation. She has been citing the fact that Blue C ...
Retinal damage by light in rats
... line either was focused upon the eye or illuminated a sheet of translucent plastic. In the latter case, the smallest diameter of the illuminated area was 4.5 cm. The animals were anesthetized with pentobarbital Sodium to a depth which occluded eye movements. The right eye of each animal was placed 1 ...
... line either was focused upon the eye or illuminated a sheet of translucent plastic. In the latter case, the smallest diameter of the illuminated area was 4.5 cm. The animals were anesthetized with pentobarbital Sodium to a depth which occluded eye movements. The right eye of each animal was placed 1 ...
Visual Acuity
... The visual acuity categorized (10th Revision of the WHO International Statistical Classification of Diseases). ...
... The visual acuity categorized (10th Revision of the WHO International Statistical Classification of Diseases). ...
View - OhioLINK Electronic Theses and Dissertations Center
... benefits of the technology and the pathways that will lead to its success in the marketplace. ...
... benefits of the technology and the pathways that will lead to its success in the marketplace. ...
Insulin-like growth factor II may play a local role in the
... We have shown that IGF-II expression by head mesoderm intensifies in the periocular mesoderm as it condenses and differentiates to form the outer collagenous coat of the developing eye. This expression rises from E14, to a peak before birth, and declines after parturition to undetectable levels in t ...
... We have shown that IGF-II expression by head mesoderm intensifies in the periocular mesoderm as it condenses and differentiates to form the outer collagenous coat of the developing eye. This expression rises from E14, to a peak before birth, and declines after parturition to undetectable levels in t ...
SPECIAL SENSES
... Fills the area behind the lens Maintain the shape of the eyeball Also, refracts light rays ...
... Fills the area behind the lens Maintain the shape of the eyeball Also, refracts light rays ...
2-in ensuring a normal tear film and tear drainage.
... 2-secrete the oily part of the tear film. 3-spread the tear film over the conjunctiva and corneaprevent drying of the eyes 4-contain the puncta through which the tears drain into the lacrimal drainage system. Components:1. A surface layer of skin. 2. The orbicularis muscle. 3. A tough collagenous l ...
... 2-secrete the oily part of the tear film. 3-spread the tear film over the conjunctiva and corneaprevent drying of the eyes 4-contain the puncta through which the tears drain into the lacrimal drainage system. Components:1. A surface layer of skin. 2. The orbicularis muscle. 3. A tough collagenous l ...
Cranial Nerves
... parasympathetic axons to the orbit to reach the lacrimal n. and lacrimal gland ...
... parasympathetic axons to the orbit to reach the lacrimal n. and lacrimal gland ...
Neuropeptide Y-like immunoreactivity localizes to
... The ciliary ganglia in this study showed the same anatomic features and neural connections described previously for rhesus monkeys.20 Preganglionic parasympathetic nerves enter the ganglion at its attachment to the oculomotor nerve at the origin of the branch to the inferior oblique muscle. The gang ...
... The ciliary ganglia in this study showed the same anatomic features and neural connections described previously for rhesus monkeys.20 Preganglionic parasympathetic nerves enter the ganglion at its attachment to the oculomotor nerve at the origin of the branch to the inferior oblique muscle. The gang ...
Practice Exam 4 by Samantha
... b. Spiral ganglion through auditory nerve to the superior olive, crossover at the ventral cochlear nucleus, travel through lateral lemniscus, to the inferior colliculus, to the MGN, to the primary auditory cortex. c. Spiral ganglion through auditory nerve to the ventral cochlear nucleus, crossover ...
... b. Spiral ganglion through auditory nerve to the superior olive, crossover at the ventral cochlear nucleus, travel through lateral lemniscus, to the inferior colliculus, to the MGN, to the primary auditory cortex. c. Spiral ganglion through auditory nerve to the ventral cochlear nucleus, crossover ...
of EYE
... The Retina…that’s it! • Retina ‘lines’ the back 2/3rds of eye • 10 layers thick; all the layers are transparent except the RPE (retinal pigment epithelial) layer • Retina lies on top of the choroid • It’s in contact with the vitreous humor (fluid) • Contains cells that respond to light (photorecepto ...
... The Retina…that’s it! • Retina ‘lines’ the back 2/3rds of eye • 10 layers thick; all the layers are transparent except the RPE (retinal pigment epithelial) layer • Retina lies on top of the choroid • It’s in contact with the vitreous humor (fluid) • Contains cells that respond to light (photorecepto ...
PDF
... Non-ionizing radiation, which is produced in large amounts by welding arcs, may induce photophthalmia, keratoconjunctivitis and cataracts. Retinal injuries resulting from exposure to electric welding arcs have been reported, but such injuries are not commonly seen and may be misdiagnosed. A case is ...
... Non-ionizing radiation, which is produced in large amounts by welding arcs, may induce photophthalmia, keratoconjunctivitis and cataracts. Retinal injuries resulting from exposure to electric welding arcs have been reported, but such injuries are not commonly seen and may be misdiagnosed. A case is ...
L8-Glossopharygeal and Vagus Nerves)
... the tongue gently if necessary. Ask the patient to say "ahhh" as long as possible. Observe the palatal arches as they contract and the soft palate as it swings up and back in order to close off the nasopharynx from the oropharynx. Normal palatal arches will constrict and elevate, and the uvula will ...
... the tongue gently if necessary. Ask the patient to say "ahhh" as long as possible. Observe the palatal arches as they contract and the soft palate as it swings up and back in order to close off the nasopharynx from the oropharynx. Normal palatal arches will constrict and elevate, and the uvula will ...
A model of giant vacuole dynamics in human
... p < 0.001), but there was significant variability in the GVL response to pressure between cell lines isolated from different donors. During perfusion, GVLs were observed “migrating” and agglomerating about the cell layer and often collapsed despite maintaining the same pressure drop. GVL formation wa ...
... p < 0.001), but there was significant variability in the GVL response to pressure between cell lines isolated from different donors. During perfusion, GVLs were observed “migrating” and agglomerating about the cell layer and often collapsed despite maintaining the same pressure drop. GVL formation wa ...
Photoreceptor cell
A photoreceptor cell is a specialized type of neuron found in the retina that is capable of phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in the cell absorb photons, triggering a change in the cell's membrane potential.The two classic photoreceptor cells are rods and cones, each contributing information used by the visual system to form a representation of the visual world, sight. The rods are narrower than the cones and distributed differently across the retina, but the chemical process in each that supports phototransduction is similar. A third class of photoreceptor cells was discovered during the 1990s: the photosensitive ganglion cells. These cells do not contribute to sight directly, but are thought to support circadian rhythms and pupillary reflex.There are major functional differences between the rods and cones. Rods are extremely sensitive, and can be triggered by a single photon. At very low light levels, visual experience is based solely on the rod signal. This explains why colors cannot be seen at low light levels: only one type of photoreceptor cell is active.Cones require significantly brighter light (i.e., a larger numbers of photons) in order to produce a signal. In humans, there are three different types of cone cell, distinguished by their pattern of response to different wavelengths of light. Color experience is calculated from these three distinct signals, perhaps via an opponent process. The three types of cone cell respond (roughly) to light of short, medium, and long wavelengths. Note that, due to the principle of univariance, the firing of the cell depends upon only the number of photons absorbed. The different responses of the three types of cone cells are determined by the likelihoods that their respective photoreceptor proteins will absorb photons of different wavelengths. So, for example, an L cone cell contains a photoreceptor protein that more readily absorbs long wavelengths of light (i.e., more ""red""). Light of a shorter wavelength can also produce the same response, but it must be much brighter to do so.The human retina contains about 120 million rod cells and 6 million cone cells. The number and ratio of rods to cones varies among species, dependent on whether an animal is primarily diurnal or nocturnal. Certain owls, such as the tawny owl, have a tremendous number of rods in their retinae. In addition, there are about 2.4 million to 3 million ganglion cells in the human visual system, the axons of these cells form the 2 optic nerves, 1 to 2% of them photosensitive.The pineal and parapineal glands are photoreceptive in non-mammalian vertebrates, but not in mammals. Birds have photoactive cerebrospinal fluid (CSF)-contacting neurons within the paraventricular organ that respond to light in the absence of input from the eyes or neurotransmitters. Invertebrate photoreceptors in organisms such as insects and molluscs are different in both their morphological organization and their underlying biochemical pathways. Described here are human photoreceptors.