sarcotubular

adjective
sar·​co·​tu·​bu·​lar | \-ˈt(y)ü-byə-lər \

Medical Definition of sarcotubular 

: relating to or being the system of membranes, vesicles, and tubules in the sarcoplasm of a striated muscle fiber that make up the sarcoplasmic reticulum and the T tubules

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