Innominate Grooves of the Colon: Morphological Characteristics and Etiologic Mechanisms

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Abstract
The morphological characteristics of innominate lines and grooves of the human colonic mucosa are described. There are 3 basic mucosal patterns: linear circumferential, network and mixed. Lymphoid collections occur at frequent and regular intervals along the course of the lines. These collections split the muscularis mucosa, producing a series of perforations in this thin sheet of muscle. Where contractions of the muscle layer are predominantly longitudinal, those occurring between 2 rows of lymphoid tissue elevate the overlying mucosa to form ridges and trooves. Ba tends to accumulate in the grooves, particularly since the mucosa is thinner in these regions.

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