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