This dilated funnel like part is called Bowman's Capsule. It has a tuft of capillaries. The fluid which comes out of these capillaries is filtered by Bowman's Capsule.

The Bowman's capsule is a multilayered structure, comprising up to seven layers of microfilaments. 1,2 Morphologically, PECs resemble squamous epithelial cells, with a small and remarkably flat ...