Voynich's anatomy

[ololololo]

There was such an analogy on the forum:
   
For some reason, I think this is a hint towards an anatomical theory. The author could have used similar objects to disguise organs in his illustrations.
So, what means a spindle?

Now for the You are not allowed to view links. Register or Login to view. interpretations.
Given that the top illustrations may depict organic fluids in the form of alchemical elements, the lower illustrations may be related to the urinary system:
1). The upper part is the urinary tract, and the lower part is the bladder.
2). The image below shows the liver, and the image above may depict the flow of fluids (i.e., it does not show the organ, but rather the flow of these fluids).