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THE CORPUS CALLOSUM AND STEREOPSIS. The corpus callosum, a huge band of myelinated fibers, connects the two cerebral hemispheres. Stereopsis is one mechanism for seeing depth and judging distance. Although these two features of the brain and vision are not closely related, a small minority of corpus-callosum fibers do play a small role in Stereopsis.
The periodontal fibers of the periodontal ligament are primarily composed of bundles of type I collagen fibrils. They have been classified into several groups on the basis of their anatomic location. The following constitute the principal fiber groups of the periodontal ligament: Alveolar crest fibers.