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I am not quite seeing how the T-tubule and sarcolemma is connected. It says that the T-tubule is an "invagination" of the sarcolemma, which is sarcolemma folded from the inside to form a T-tubule

Can someone verify whether the following picture is a good presentation of this relationship? enter image description here

Fraïssé
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    Klien bottle has zero volume. It is not distantly related to the t-tubules or other such structures. – WYSIWYG Mar 24 '15 at 18:12
  • Can you provide a citation stating the relationship between the two structures? – March Ho Mar 24 '15 at 18:37
  • So he's just trying to find an analogy for how the sarcolemma folds into the t-tubule, and if this is anything like how a klein bottle works. – CKM Mar 25 '15 at 00:12

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If we're looking at diagrams for the t-tubule with respect to the sarcolemma, we see the two are actually fused:

enter image description here

enter image description here

The function therein is to allow depolarization to penetrate the interior of the cell quickly. The surface isn't transected anywhere, it simply folds inward. You can visualize this by sort of pushing a hole through some putty with a finger, and making a hole to the other side. Really no need to upvote me here, just easier to paste images in answers.

CKM
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