*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.
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*Secretory [[IgA]] and IgM provide humoural immunity and help prevent attachment of pathogens to the intestinal epithelium.
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*Secretory [[IgA]] and [[IgM]] provide humoural immunity and help prevent attachment of pathogens to the intestinal epithelium.