Study Guide for dental students and dentists

This is a comprehensive study guide for dental students and dentists. On this site you will Histology of the Human Eye for UCLA Dental Students. In addition there is a comprehensive study guide for the Systemic Pathology.

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Sunday, October 16, 2005

Anatomy of the Eye- Vitreous

VITREOUS The vitreous cavity is simply an expanded extracellular space that normally contains 4.0 ml of clear gelatinous substance that is composed largely of water, hyaluronic acid, and collagen. The vitreous normally contains anteroposterior oriented collagen fibrils and occasional macrophages or hyalocytes. The presence of even small numbers of acute or chronic inflammatory cells within the vitreous is distinctly abnormal. The vitreous has distinct attachments to ocular structures. It is most firmly attached attached anteriorly in a circumferential band extending from the posterior pars plana to a few millimeters behind the ora serrata in what has been termed the vitreous base. Traction exerted by the vitreous body at the base results in hyperpigmentation of the underlying pigment epithelium and is evident grossly (Figure 2-1). The vitreous is also attached to the retina over retinal blood vessels and at the optic disc. These attachments are important to understanding vitreous traction, retinal tears, and retinal detachment, for which vitrectomies are sometimes performed.