A close-up of Roron Corobb's throat while he used Force bellow.
An Ithorian's anatomy included a throat sack. This sack contained their four throats.
The book Monsters and Aliens from George Lucas, which came out in 1993, was the first place the throat sack was brought up. Leland Chee, an employee at Lucasfilm who is in charge of the Holocron continuity database, has stated that the book's information is considered non-canonical. Later, with the release of Musings of an Ithorian on Hyperspace, the throat sack became canon.
- Musings of an Ithorian on Hyperspace (content obsolete and backup link not available) (Only mentioned)