perivascular fibrous capsule

[pĕr′ə-văskyə-lər]
n.
  1. A layer of connective tissue ensheathing the hepatic artery, portal vein, and bile ducts as they ramify within the liver.Glisson's capsule
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.