Eye choroid layer
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Rhesus monkey, Helly's fluid, H. & E., 612 x.
The choroid layer of the eye is a highly vascular and pigmented coat surrounding the retina. Shown in this figure is a part of the retina adjoining the choroid layer, as well as the major choroid layers. In the outermost layer of the retina, the following structures are seen:
Rods and cones: Neuroepithelial cells sensitive to light, arranged vertically and parallel. (See also Plates 306, 307, 308.)
Pigment epithelium: Single layer of pigmented cuboidal epithelial cells firmly bound to the choroid layer. Contains melanin pigment. In retinal detachments, the pigment epithelium remains attached to the choroid. The two major layers of the choroid seen in this plate are the following:
Choriocapillary layer: Composed of a network of wide lumen capillaries disposed in one plane and separated by delicate connective tissue fibers. Note that pigmented cells are essentially lacking in this layer. This layer supplies nutrition to the cells of the outermost layers of the retina.
Choriovascular layer: Filled with pigmented cells (melanin) and large-sized vessels.
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