semidecussation

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• semidecussation — Incomplete decussation such as occurs in the human optic chiasm. * * * semi·de·cus·sa·tion (sem″e de″kə saґshən) 1. an incomplete crossing of nerve fibers. 2. decussatio pyramidum …   Medical dictionary

• theory — A reasoned explanation of known facts or phenomena that serves as a basis of investigation by which to seek the truth. SEE ALSO: hypothesis, postulate. [G. theoria, a beholding, speculation, t., fr. theoros, a beholder] adsorption t. of narcosis… …   Medical dictionary