What surrounds the portal triad?

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The key idea is that the portal triad is nestled within the hepatoduodenal ligament and is encased by a fibrofatty sheath. This fatty connective tissue envelope surrounds the hepatic artery proper, portal vein, and bile duct as they travel together, helping to anchor and protect them. Glisson's capsule and the hepatic capsule refer to the liver’s outer coverings, not the tissue surrounding the triad, and while the hepatoduodenal ligament is peritoneal, the specific wrapping around the triad is this fibrofatty sheath.