2)submucosa: more dense CT ● small artery and vein,L∨ e glands(esophagus and duodenum) submucosa n plexus -multipolar N -unmyelinated NF -function: regulate the contract of SM and secreting of gland Plica: projection of mucosa and submucosa2) submucosa: more dense CT small artery and vein, LV glands (esophagus and duodenum) submucosa N plexus: -multipolar N -unmyelinated NF -function: regulate the contract of SM and secreting of gland *Plica: projection of mucosa and submucosa