4 layers of tissue in the Alimentary Canal Organs

• From innermost to outermost, esophagus to the large intestine
• Mucosa: Innermost, moist membrane consists of surface epithelium that is mostly simple columnar epithelium (except for esophagus- stratified squamous epithelium)
• Mucosa: Small amount of connective tissue (lamina propria)
• Mucosa: Scanty smooth muscle layer
• Mucosa: Lines the cavity (known as the lumen)
• Submucosa: Beneath the mucosa
• Submucosa: Soft connective tissue with blood vessels, Nerve endings, mucosa (associated lymphoid tissue, lymphatic vessels)
• Muscularis externa (smooth muscle): Inner circular layer
• Muscularis externa (smooth muscle): Outer longitudinal layer
• Serosa:

  -Visceral peritoneum: innermost layer that is continuous with the outermost layer
• Serosa:

  -Parietal peritoneum: outermost layer that lines the abdominopelvic cavity by way of the mesentery