One of my objects doesn't appear in 3D View Full For my imaging and modeling class, we are to make an animation as part of our final. I've imported 4 objects from Slicer into Blender and have the animation that I want down. 

However, one of the objects (Corpus) isn't visible in 3D View Full, and if I assign it a material, the material doesn't show up.

This is my first time working with any animation software and I'd appreciate any help.

Here is the blend file.

Thank you!
The Corpus is created from individual edges but not Curves. As far as Blender is concerned it has no mass and there is nothing to render. 

Go to the Object menu and Convert To select Curve From Mesh/Text.

Now you can go into the Curve settings and Extrude to give the threads depth.