Reissner's fiber


Reiss·​ner's fiber
: a band of fibers arising from the roof of the midbrain in many vertebrates, passing along the aqueduct and fourth ventricle to enter the central canal of the spinal cord, ending in the regions of the spinal nerves, being especially large in fishes, and probably taking part in visual reflexes or regulating flexion of the body

Word History


after Ernst Reissner †1878 German anatomist

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Dictionary Entries Near Reissner's fiber

Cite this Entry

“Reissner's fiber.” Dictionary, Merriam-Webster, Accessed 15 Jul. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!