*The lamina propria contains macrophages, B and T lymphocytes, plasma cells, and [[Mast Cells|mast cells]].
*The lamina propria contains macrophages, B and T lymphocytes, plasma cells, and [[Mast Cells|mast cells]].
*Lymphoid aggregates known as [[Peyer's Patches - Anatomy & Physiology|Peyer's patches]] within the [[Small Intestine - Anatomy & Physiology|small intestine]] aid in immunity.
*Lymphoid aggregates known as [[Peyer's Patches - Anatomy & Physiology|Peyer's patches]] within the [[Small Intestine - Anatomy & Physiology|small intestine]] aid in immunity.
−
*Secretory IgA and IgM provide humoural immunity and help prevent attachment of pathogens to the intestinal epithelium.
+
*Secretory [[IgA]] and IgM provide humoural immunity and help prevent attachment of pathogens to the intestinal epithelium.