General structure of the digestive tube

· Mucosa; Mucous membrane (Tunica mucosa)

o Epithelium

§ stratified sqamous

§ one-layered cylindrical

o Lamina propria mucosae

o Muscularis mucosae (Lamina muscularis mucosae)

folds (plicae), villi, microvilli, glands (glandulae), papillae

· Submucosa (Tela submucosa)

o absent in dorsum of tongue and gall-bladder

o enalbes sliding movements of the mucosa against the muscular layer.

o clinical importance: oesophagus – rich venous plexuses (as a part of the portocaval anastomoses system), duodenum - glandulae duodenales (Brunneri)

· Muscular layer; Muscular coat (Tunica muscularis)

o stratified (beginning and end of the tube)

o non-stratified = smooth

§ outer longitudinal layer (stratum longitudinale)

§ ihned circular layer (stratum circulare)

§ exception: stomach (3 layers)

· Outer layer; Outer coat

o Adventitia

o Peritoneum = Serosa; serous coat (Tunica serosa)

§ Subserosa; Subserous layer (Tela subserosa)

Part	Epithelium		Muscular layer		Outer layer
	Stratified sqamous	Cylindrical	Stratified	Smooth	Adventicia	Peritoneum
Oral cavity + Pharynx	+	-	+	-	+	-
Oesophagus	+	-	oral 1/2	aboral 1/2	cervical and thoracic part	abdominal part
Stomach	-	+	-	+	-	+
Duodenum	-	+	-	+	+	bulbus
Jejunum + ileum	-	+	-	+	-	+
Colon	-	+	-	+	+	+
Rectum	-	+	-	+	oral 1/3	aboral 2/3
Anus	+	-	+	+	+	-