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.
Term coined by Gary Larson that is most commonly used to describe the arrangement of spikes at the tip of a stegosaur's tail. can be used to describe any such spike arrangement. The Urban Dictionary Mug. One side has the word, one side has the definition. Microwave and dishwasher safe.