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Dictionary > Normal tissue > Smooth muscle

Detail 1

Smooth muscle

Smooth muscle is represented from the stomach wall.

Smooth muscle tissue is defined as a non-striated muscle tissue comprising involuntary contractile elements surrounding tissues and structures where contraction is part of normal function. The main cell type in smooth muscle tissue is the smooth muscle cell, which similar to myocytes in skeletal and cardiac muscle, predominatly contains actin and myosin proteins. Parenchymal smooth muscle cells are homogenous and tightly arranged together as larger muscular layers that can propagate movement. Parenchymal smooth muscle typically surrounds and forms an integrated part of the respiratory, gastrointestinal and urogenital tract. The main component of the uterus is also smooth muscle tissue, which allows for contraction and normal function at parturition (child birth). Smooth muscle is also a vital component of the vasculature, where more heterogeneous smooth muscle cells are located around blood vessels to control the flow of blood. Histologically, smooth muscle cells exhibit a fairly large cytoplasm with indistinct borders and have single blunt-ended oval nuclei.


Anatomy 1


Normal smooth muscle