My piriformis

I think I understand more about my butt pain more today.
I come to read  about a muscle that I have never heard of before this week called piriformis that stretch across from the tailbone to thigh bone.
And it causes sciatica, because the sciatic nerve is just right underneath it so if it is overly tensed or overworked it will certainly pinch on the nerve.
And the cause of it is a weak gluteal muscle, pronation of the foot, and tight adductor.

No wonder I feel pain to keep my legs together (lateral rotation) when I am doing cobra pose (which is a bit of hip extension i supposed)
And when I worked on my very weak locust pose (which is gluteal muscles strengthening to get hip extension), my butt pain gets better!
Because now that my gluteal muscles are stronger, the piriform doesn't have to compensate so much for them?
And all the exercise that relieve piriformis syndrome seems to be the yoga poses that work for me!
What~
It's just a bit of eureka moment but I am not 100% sure.
But it's definitely cool~ like I don't even know what is the name of my problem before this.
Now what I am reading in class finally has a very close relevance to my own pains and concerns.