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| | #REDIRECT [[Paper - The critical period in the development of the intestines (1914)]] |
| [[Paper - The Critical Period in the Development of the Intestines|The Critical Period in the Development of the Intestines]] (1914) Amer. J of Anatomy. 16: 427 – 445. | |
| [[Historic Embryology Papers]]
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| | {{Gastrointestinal Tract Links}}
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| {{Historic Disclaimer}}
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| =The Critical Period in the Development of the Intestines=
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| C. R. Bardeen
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| From the Anatomical Laboratory, University of Wisconsin
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| Eleven Figures (Four Plates)
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| In studying the variations of structure found in any part of the body it is of importance to distinguish the less variable from the more variable features. As a rule, the less variable features are associated with fundamental processes occurring early in onto-genetic development, the more variable features with processes of growth and differentiation occurring later in ontogenetic development. Thus while it is comparatively rare to have variation in the number of the digits, finger prints are specific for each individual.
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| In the development of the human intestines three fundamental loops are formed. First, the entero-colic which extends forward into the umbilical cord and is supplied by the superior mesenteric artery. Second, the gastro-duodenal, which projects to the right at the base of the entero-colic loop and is supplied chiefly by a branch of the coeliac artery. Third, the left colic which projects to the left at the base of the entero—colic loop and is supplied chiefly by the inferior mesenteric artery.
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| The entero-colic loop undergoes normally an elaborate development and gives rise to the distal part of the duodenum, the jejunum, ileum, caecum, ascending colon and the right half of the transverse colon. The center of the base of the mesentery of this loop is in the region of the origin of the omphalo—mesenteric or superior mesenteric artery from the aorta. This becomes fixed at an early period opposite the first lumbar vertebra and seldom varies in position. The loop itself shows frequent variations in development, some of a fundamental character, others slight. These will be discussed below.
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| {{Footer}}
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| [[Category:Human]][[Category:1910's]]
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| [[Category:Charles Bardeen]]
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