Abstract
Significant advances have been made in the study of the small bowel. Part II of this two-part review of the small bowel examines the early development and later ageing of the small bowel; the effect of diabetes, alcohol, radiation and HIV on the small bowel; enteral and parenteral nutrition; the brush border membrane and enterocyte proliferation; and peptide hormones (including transforming growth factors, motilin, peptide YY and cholecystokinin).