Unstriped Muscle of a Newt

Unstriped muscle, or plain muscle, forms the proper muscular coats. Shown is unstriped muscle cells from the mesentery of a newt. The sheath exhibits transverse markings. B, from a similar preparation, showing that each muscle cell consists of a central bundle of fibrils, F, (contractile part), connected with the intranuclear network, N, and a sheath with annular thickenings, St. The cells show varicosities due to local contraction, and on these the annular thickenings are most marked.

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