Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Human, 10% formalin, H. & E., 162 x.
This plate shows smooth muscle fibers from two locations. In A, they are seen distributed as an outer longitudinal and an inner circular layer in the wall of the jejunum. These two layers are separated by connective tissue and by neurons and fibers of Auerbach's* autonomic plexus. In B, a smooth muscle fiber bundle of the arrector pili muscle is seen between bundles of connective tissue in the skin. Note the elongated nuclei and homogeneous cytoplasm. Arrector pili muscles originate in the papillary connective tissue and insert on hair follicles. Their contraction erects hairs in animals and produces "goose-flesh" in man. Note the proximity of the arrector pili muscle to a sebaceous gland.
*Auerbach was a nineteenth-century German anatomist.
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