{"id":3063,"date":"2020-12-13T21:28:08","date_gmt":"2020-12-13T19:28:08","guid":{"rendered":"https:\/\/meddists.com\/learn\/pre-clinical\/histology\/neurohistology\/eyes-eyelids\/eye-layers\/"},"modified":"2021-12-04T11:23:49","modified_gmt":"2021-12-04T09:23:49","slug":"eye-layers","status":"publish","type":"page","link":"https:\/\/meddists.com\/learn\/pre-clinical\/histology\/nervous-system\/eyes-eyelids\/eye-layers\/","title":{"rendered":"Eye layers"},"content":{"rendered":"\n
\"\"<\/a>
Figure 1. Anatomy of the eye.<\/strong><\/figcaption><\/figure><\/div>\n\n\n\n

The eye consists of both an optical system<\/strong> that allows the change of focus and controls the amount of light coming in and a sensory apparatus<\/strong> that receives concentrated visual information and transduces it to an electrical impulse that is carried by the optic nerve.<\/p>\n\n\n\n

Our histological slides are of a meridional plane<\/strong>, which is perpendicular to the equatorial plane.<\/p>\n\n\n\n

Layers of the eye<\/h3>\n<\/span>\n\n\n

The wall of the eye can be divided into three layers:<\/p>\n\n\n\n

  1. External (fibrous)<\/li>
  2. Middle (vascular)<\/li>
  3. Inner (retinal)<\/li><\/ol>\n\n\n<\/span>\n

    External (fibrous) layer<\/h4>\n<\/span>\n\n\n

    Also called the corneoscleral layer<\/strong>, since it consists of the cornea<\/strong> (transparent, avascular outermost layer at the front of the eye), and the sclera<\/strong> (the “white” of the eye — highly vascular).<\/p>\n\n\n<\/span>\n

    Middle (vascular) layer<\/h4>\n<\/span>\n\n\n

    Also called the uvea.<\/strong> Consists of:<\/p>\n\n\n\n

    1. Iris<\/strong> with the pupil<\/strong> in the middle — The aperture through which light goes in.<\/li>
    2. Ciliary body<\/strong> – Secretes aqueous humor and produces zonula fibers to attach the lens. Similar to the choroid plexus and stria vascularis.<\/li>
    3. Choroid<\/strong> \u2013 A dark vascular sheet.<\/li><\/ol>\n\n\n<\/span>\n

      Inner (retinal) layer<\/h4>\n<\/span>\n\n\n

      Consists of the retina<\/strong> which at large, is the sensory apparatus containing photo-receptors.<\/p>\n<\/span>

      Layers of the eye<\/h3>

      External (fibrous) layer<\/h4>

      Middle (vascular) layer<\/h4>

      Inner (retinal) layer<\/h4><\/div>","protected":false},"excerpt":{"rendered":"

      The eye consists of both an optical system that allows the change of focus and controls the amount of light coming in and a sensory apparatus that receives concentrated visual information and transduces it to an electrical impulse that is carried by the optic nerve. Our histological slides are of a meridional plane, which is perpendicular to […]<\/p>\n","protected":false},"author":23,"featured_media":0,"parent":3033,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3063","page","type-page","status-publish","hentry"],"yoast_head":"\nEye layers – Meddists<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/meddists.com\/learn\/pre-clinical\/histology\/nervous-system\/eyes-eyelids\/eye-layers\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" 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