Foundation Volume 1, Chapter 22. Choroid and Suprachoroid

30 Апр 2014 | Author: | Комментарии к записи Foundation Volume 1, Chapter 22. Choroid and Suprachoroid отключены
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The uveal is a brown, continuous composed primarily blood vessels, and connective From anterior posterior, the tract has distinct subdivisions: iris, the body, and choroid (Fig. ). The and ciliary are referred as the uvea. The uvea is with the

Fig. 1. sphere with ( arrow ciliary body bracketed ), choroid on Pupil on and opening optic nerve right. (Courtesy Stephen Gordon)

The uvea a spherical containing two openings. The opening, the is bordered the iris. pupil diameter from 1 8 mm. iris leaflet bathed in humor and the anterior into anterior posterior chambers. size and of melanocyte granules determines iris color. ciliary body between the and the functions during and produces aqueous humor. iris joins ciliary body the recess the anterior angle. The portion of ciliary body the pars The posterior of the body, the plana, merges the

choroid at ora serrata. choroid extends from the body without to the opening of uveal tract, canal for optic nerve. optic canal surrounded by choroid and sclera.

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The uvea firmly attached the sclera three sites: anteriorly at scleral spur; at the of the veins; and posteriorly at optic nerve. spaces are between the body and sclera and the choroid the sclera. contiguous potential are called supraciliary and spaces, respectively. the entire is lined two continuous derived from neuroectoderm. These serve distinct functions in three subdivisions the uvea. layers are in segments the anterior posterior pigmented of the the inner and outer ciliary body

epithelium; and inner neurosensory and the retinal pigment (RPE) (Fig. ). The epithelial layer separated from underlying uvea a continuous membrane. The of this will deal the posterior the choroid.

Fig. 2. layer ( ) of optic cup rise to posterior iris epithelium, ciliary nonpigmented epithelium, the neurosensory Outer layer arrowhead ) the optic gives rise the anterior pigmented epithelium, body pigmented and the pigment epithelium.

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