T-tübül

Also known as GO:0030315, transverse tubule

T-tubules (transverse tubules) are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells. With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell, and also play an important role in regulating cellular calcium concentration.

Key facts

Anatomy.Name: T-tubule
Anatomy.Latin: tubulus transversus
Anatomy.Image: Blausen_0801_SkeletalMuscle.png
Anatomy.Caption: Skeletal muscle fiber, with T-tubule labelled in zoomed in image.
Anatomy.Image2: 1023 T-tubule.jpg
Anatomy.Caption2: T-tubule structure and relationship to the sarcoplasmic reticulum in skeletal muscle
Anatomy.Width: 400
Anatomy.Part_of: Cell membrane of skeletal and cardiac muscle cells