Anatomy Question:

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Rollerblading to class one morning without her wrist guards on Elizabeth hit a curb and fell onto her outstretched left hand) When she got to school, she noted tenderness in her wrist in the area of her anatomical snuffbox and was concerned she may have fractured one of the bones in her wrist.
The carpal bone forming part of the floor of the anatomical snuffbox, which is most often fractured, is the: