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optic neuritis and retrobular neuritis, both of which affect the optic nerve, may occur as a consequence of viral infection such as meningitis or with multiple sclerosis, causing visual disturbances. Symptoms include partial or complete loss of vision, usually in one eye, and sometimes pain. Vision may return when the inflammation subsides, depending on the cause. in men over age 60, optic neuritis may result from temporal arteritis (chronic inflammation of the carotid artery), a condition associated with AUTOIMMUNE Camel Online Thymus The thymus is a small gland located behind the sternum (breastbone) just below the notch at the base of the neck. its two lobes, each about the size of a thumb in an adult man, fuse into a single structure at the top. The thymus is significantly larger in a child, nearly tripling in size from birth to puberty and then diminishing to about a seventh of its birth size by adulthood. in childhood the thymus produces T-cell lymphocytes, some of which remain in the thymus and some of which migrate to other lymphatic tissue throughout the body. By adulthood the bone marrow takes over production of T-cell lymphocytes, which travel to the thymus, where they mature as the body needs them.