Nervus impar



Former name for the more common anatomical term, filum terminale


Literally, nervus impar means an unpaired nerve. This anatomical part is previously thought of as a nerve since it is found along with the nerves that make up the cauda equina. Later, nervus impar was found to be fibrous in structure, and devoid of nerve substances apart from the upper end.1

Word origin: Latin impār (unequal)


Reference(s): 1 Quain J. 1848. Elements of Anatomy [Internet]. 5. [2006 Oct 09, cited 2013 May 04] Available from:

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