(i) Structure of pharynx, esophagus, stomach and intestines.
(ii) Formation of lining of digestive tract.
(iii) Formation of kidney, liver and pancreas.
(iv) Formation of middle ear and tonsils.
(v) Formation of thymus, thyroid and parathyroid.
(vi) Covering of the excretory canal, urethra and urinary bladder.
(vii) Formation of respiratory system and reproductive system.
