The first portion of the nephron has in the past been called “The Malpighian Corpuscle” after the individual that discovered it (now called the glomerulus).
Here’s a blog post on Malpighi: https://www.arkanalabs.com/malpighi-glomerulus/
Quick note: This post is to be used for informational purposes only and does not constitute medical or health advice. Each person should consult their own doctor with respect to matters referenced. Arkana Laboratories assumes no liability for actions taken in reliance upon the information contained herein.