The dura mater has two layers, or lamellae: The superficial layer (also called the periosteal layer), which serves as the skull's inner periosteum, called the endocranium; and a deep layer called the meningeal layer; the actual dura mater.
The term thagomizer was coined by Gary Larson in humor, in a 1982 Far Side comic strip, in which a group of cavemen in a faux-modern lecture hall are taught by their caveman professor that the spikes on a Stegosaur's tail are so named after the late Thag Simmons.
Gary Larson was born on August 14, 1950 in Tacoma, Washington, USA. He is known for his work on Tales from the Far Side (1994), Tales from the Far Side II (1997) and Calvinball! (2015). He has been married to Toni Carmichael since 1987. See full bio Â».