(Endoderm) Germ layer derivatives at a glance

1. Primative gut

2 . Yolksac

1 .Primative guts derivatives:

                                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

2. Yolksac :

                                A.Cloaca:

                                B .Premordial germ cell:

A.Cloaca ;

          B. Premordial germ cell:

           1. Spermatozoa

           2 .Ovum

Collected and concise only for post graduate students,Pictures are collected from Google.