Duodenum longitudinal section
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed
Human, Helly's fluid, H. & E., 612 x.
Outer longitudinal layer of smooth muscle in the tunica muscularis of the duodenum. Muscle fibers are divided by connective tissue septa into bundles. Each muscle cell has a central nucleus and abundant sarcoplasm. The muscle fibers are long, slender, and spindle-shaped. Note that differentiation between smooth muscle cells and connective tissue fibers is difficult in this preparation because of the staining method used (H. & E.). Differentiation of smooth muscle from connective tissue using specific stains is shown in Plates 35, 38, 155, and 156.
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