Hello,
I would like to help you with your project.
I'm a 3D artist that specializes in creating 3d models based on reference images. I can create the capillaries that you are describing with digital sculpting software and texture them for rendering. This can be completed in one day easily.
Please check my portfolio here in Freelancer.com for examples of my previous work.
Feel free to message me at anytime, I'll be glad to answer.
Thank you for your consideration.