Plate 10.201 Jejunum
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Cat, 10% formalin, H. & E., 612 x
This is a section of part of the wall of the jejunum showing the muscularis mucosae and submucosae. In the muscularis mucosae, note the two layers of smooth muscle: inner circular and outer longitudinal. The submucosa is composed of loose connective tissue and contains the ganglion cells of Meissner's plexus. These cells receive preganglionic parasympathetic vagal fibers. Postganglionic parasympathetic fibers pass to the muscles of the gut wall and glands. They excite muscular (peristaltic) activity and intestinal secretion. Sympathetic postganglionic nerve fibers, which are also present, inhibit these functions.
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