Illustrator fun | vector drawings

Not too sure what this is meant to be, i was just having a bit of fun on illustrator- when i should have been doing work- and started doing some drawings and playing around with all the tools. I think it looks like something out of an old medical book i can imagine this being how ligaments look when beginning to fray, or something like that, or a vessel. I love what illustrator can do, it's probably the programme i enjoy most on adobe software- it allows you to do so much.