The gastric mucosa is the
mucous membrane layer of the
stomach which contains the
glands and the
gastric pits. It is thick and its surface is smooth, soft, and velvety. In its fresh state, it is of a pinkish tinge at the
pyloric end and of a red or reddish-brown color over the rest of its surface. In
infancy it is of a brighter hue, the vascular redness being more marked. It is thin at the
cardiac extremity, but thicker toward the pylorus. During the contracted state of the organ it is thrown into numerous plaits or
rugae, which, for the most part, have a longitudinal direction, and are most marked toward the pyloric end of the stomach, and along the
greater curvature. These folds are entirely obliterated when the organ becomes
distended.
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