As referenced in the most recent episode of
This Week in Parasitism, Dickson Despommier, Mailman School of Public Health, Columbia University, and Yuzo Takahashi, Department of Parasitology, Gifu University School of Medicine, have posted hundreds of scanning electron micrographs at
www.trichinella.org. This image of T. spiralis was taken by Despommier himself.
One of the great things about this collection is that the images taken by Despommier are free to use as long as you give him the appropriate credit.