Throat sack

A throat sack was part of an Ithorian's anatomy. Their four throats were housed in this sack.

Behind the scenes
Throat sack was first mentioned in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical. Throat sack was later made canonical with the publishing of Musings of an Ithorian on Star Wars Hyperspace.