Term Name:	T-tubule
Synonyms:	transverse tubule, triad
Definition:	Invagination of the plasma membrane of a muscle cell that extends inward from the cell surface around each myofibril. The ends of T-tubules make contact with the sarcoplasmic reticulum membrane.
Ontology:	GO: Cellular Component [GO:0030315]    QuickGO    AmiGO