Stupid!! question about the lumen

[Hemichordate]

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Say there is a blood vessel, is the lumen the space inside a "tube" (where the blood is flowing) or outside the "tube".

Also, for enterocytes, is the apical side toward the lumen, or is it the basolateral side?

 

[matth87]

Lumen is in the tube.

Outside would be called the interstitum.

Apical is the lumenal side
Basolateral is the side not touching the lumen.

 

[Hemichordate]

Ok Apical in, basolateral out. Got it