Tissue type identification - (May/19/2018 )

Hi there, 

I'm struggling to identify the tissue types in the attached histological section of a rat embryo. I am speculating 1= skeletal fibres, 2= collagen, 3= smooth muscle. Please let me know if I'm going about this the right way.

Thanks in advance

Sorry, it seems I didn't press the 'attach' button after uploading the image. I've attached it now 

Wow, it is an interesting topic, I think it is wothy discussing.