Key

BGl, Brunner's glands

C, circular (inner) layer of muscularis externa

D, duct of Brunner's gland GC, goblet cells

IGI, intestinal glands (crypts)

L, longitudinal (outer) layer of muscularis externa LP, lamina propria ME, muscularis externa MM, muscularis mucosae Muc, mucosa S, serosa

SubM, submucosa V, villi arrow, duct of Brunner's gland asterisk, leaf-like villus dashed line (Fig. 1), boundary between base of villi and intestinal glands

wpg*

Lumen

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