why is the c1 vertebra called the atlas
Atlas (anatomy) It is named for the Atlas of Greek mythology, because it supports the globe of the head.[1]
Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Bracket Forms include round (also called "parentheses"), square, curly (also called "braces"), and angle brackets (also called "chevrons"); and various other pairs of symbols.