Chapter 6, Slide 1 Alveolar bone
	The tooth is anchored to the surrounding alveolar bone by the periodontal ligament. The alveolar bone directly surrounding the tooth cavity is called cribriform plate. The layer of cribriform plate into which the collagen fibers of the ligament are anchored is called bundle bone. The bone underlying the gingiva is called cortical plate (not shown). Cribriform and cortical plates are both compact bone, and are separated by spongy bone in the center of alveolar bone. The bone inferior to alveolar bone (jaw bone) is called basal bone (not shown) and is very thick.
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Legend: A, Cem,entum; B, Periodontal ligament; C, Cribiform plate; D, Marrow cavity of spongy bone; E, Bundle bone; F, spongy bone.