Limit questions asking to click on a small structure

[marekcierny]

This comprises two steps:

1. To identify small structures, neighbouring with a different structure. This can be done by: a) collecting users feedback, b) analysis of svg, ideally with consideration to which structures are named and which are not. c) analysis of user behavior: where users clicked (if a large proportion of wrong clicks are positioned +- 10px around the structure, it might be a "technical" mistake), is there a large difference between chance of "clicking correnctly" vs. "naming correctly"?
2. Limit questions asking to click on this structure. Other question formats should be preffered: multiple choice, type-in answer.

[slaweet]

I like the best the second part of c) - is there a large difference between chance of "clicking correnctly" vs. "naming correctly".
It's easiest to implement and works well in cases when the parts are not small but thin, such as this:
https://anatom.cz/view/08/image/schematicky-rez-vrstvami-sourku-a-brisni-stenysvg

It might be worth to do that analysis off-line to evaluate how big proportion of terms are we talking about and if it's worth to do such complicated hack.