Primative gut derivatives at a glance

A .Foregut:

                                                A.1.Primative pharynx: 

                                a.Pharyngeal pouch- Thymus ,Middle ear ,Paratahyroid gland, Ultimobranachial                                                                  body

                                b.Epithelial component –Posterior region of buccal cavity ,

                                                              Submandibular, Sublingual, Thyroid glands, Tongue,  most                                                            of the Pharynx, Larynx, Trachea, Lung.

                                A.2.Epithelial components – of Oesophagus ,Stomach,Liver,Pancreas,upper part                                                        of duodenumup to ampula of vatter.

                B.Midgut:            Epithelial component and glands of lower part of duodenum (below                                               ampulla of Vater), Small gut, large gut up to right 2/3^rd of transverse                                                  colon

                C.Hindgut:           Epithelial components of Large gut from left 1/3^rd of transverse colon                                          upto Middle transverse fold of rectum