Remember that those plexuses are in the muscle layer or submucosal layer, so a normal biopsy with just the mucosa wouldn't cut it, you need a sample of submucosa to see if the submucosal plexus is there or not, right?

记住！神经丛存在于肌层或黏膜下层，因此普通黏膜活检无法取到，需要黏膜下层的标本来检查是否有黏膜下层神经丛。