Primitive Gut Tube

The primitive gut tube is formed by incorporation of the yolk sac into the embryo during cranial-caudal and lateral folding (Figure III-3-8).

• The epithelial lining and glands of the mucosa are derived from endoderm.

■ The lamina propria, muscularis mucosae, submucosa, muscularis externa, and adven-titia/serosa are derived from mesoderm.

The epithelial lining of the gut tube proliferates rapidly and obliterates the lumen followed by recanalization.

The primitive gut tube is divided into the foregut, midgut, and hindgut, each supplied by a specific artery (Table III-3-8).

Table IIX-3-1. Adult Structures Derived From Each of the Three Divisions of the Primitive Gut Tube

(Superior Mesenteric Artery)

Hindgut , (Inferior Mesenteric Artery)

Esophagus

Duodenum 2nd, 3rd, 4th part

'Transverse colon (distal third)

Stomach

Jejunum

Descending colon

Duodenum 1st part

Ileum

Sigmoid colon

Liver

Cecum

Rectum

Pancreas

Appendix

Anal canal (upper part)

Biliary apparatus

Ascending colon

Gall bladder

Transverse colon (proximal two thirds)

Pharyngeal pouches*

Lungs*

Thyroid*

* These are derivatives of the primitive gut tube but not pari of the gastrointestinal tract per se.

* These are derivatives of the primitive gut tube but not pari of the gastrointestinal tract per se.

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