Human anatomy, including structure and development and practical considerations . embling adenoid tissue,covered by a single layer of columnar epithelium exhibiting a cuticular border. Thechief difference, on the other hand, is the absence of villi, in consequence of whichthe velvety appearance imparted by the latter is not seen in the large intestine.Valvulae conniventes are also wanting, although there are projections into the largegut involving all or a part of the coats internal to the serous tunic. The muscularismucosae is less regular in its development, being feebly represented in the c

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Human anatomy, including structure and development and practical considerations . embling adenoid tissue, covered by a single layer of columnar epithelium exhibiting a cuticular border. Thechief difference, on the other hand, is the absence of villi, in consequence of whichthe velvety appearance imparted by the latter is not seen in the large intestine.Valvulae conniventes are also wanting, although there are projections into the largegut involving all or a part of the coats internal to the serous tunic. The muscularismucosae is less regular in its development, being feebly represented in the colon andexceptionally thick in the rectum. The glands of Lieberkuhn in general resemble those of the small intestine, but are larger (about .45 mm. in length), and form a more regular and less inter- 1658 HUMAN ANATOMY. rupted layer of parallel tubules. The largest ones are in the rectum, where theymeasure.7 mm. (Verson). The lininjj; of the j^laiicls is conspicuous on account ofthe great number of goblet-cells, which in the mitklle and upper parts of the tubules Fig. 1406. 0.9. ffiPi