Which layer lies immediately interior to the muscular layer of the gallbladder wall?

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Multiple Choice

Which layer lies immediately interior to the muscular layer of the gallbladder wall?

Explanation:
The gallbladder wall is arranged in layers from inside to outside as mucosa (epithelium), a smooth muscle layer, then serosa. The layer directly interior to the muscular layer is the mucosa, whose surface is the inner epithelial lining. So the inner epithelial layer best fits as the structure just inside the muscle. The subserosal and outer serosal layers lie outside the muscular layer, and the muscular layer itself is the middle layer, not the interior.

The gallbladder wall is arranged in layers from inside to outside as mucosa (epithelium), a smooth muscle layer, then serosa. The layer directly interior to the muscular layer is the mucosa, whose surface is the inner epithelial lining. So the inner epithelial layer best fits as the structure just inside the muscle. The subserosal and outer serosal layers lie outside the muscular layer, and the muscular layer itself is the middle layer, not the interior.

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