Incomplete decussation such as occurs in the human optic chiasm.
Farlex Partner Medical Dictionary © Farlex 2012


(sĕm″ē-dē″kŭs-sā′shŭn) [″ + decussare, to make an X]
Incomplete crossing of nerve fibers.
Medical Dictionary, © 2009 Farlex and Partners


The rearrangement of the fibres of the optic nerves occurring in the optic chiasma in which about half of them from each optic nerve pass on to the contralateral optic tract. Thus each optic tract contains one half of the fibres of the ipsilateral optic nerve (representing the ipsilateral half visual field) and one half from the contralateral optic nerve (representing the contralateral half visual field). Syn. semidecussation. See decussation.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann