Sign Up for a Free Account

This is an image preview.
Start a Free Account
to view the full image.

  • Nearly 3,000 illustrations, including video clips of neurologic disorders.

  • Every article is reviewed by our esteemed Editorial Board for accuracy and currency.

  • Full spectrum of neurology in 1,200 comprehensive articles.

Neurofibrillary tangles - paired helical structure (electron micrograph)

Note periodic constrictions. (approximately x100,000) (Contributed by Dr. David Geldmacher.)