Far from needing to be convinced, the report states, most French people polled for the report already consider wine a food, if it is defined as " a substance with nutritive components absorbed by the digestive tube ."
12.
At the end of the fourth week the yolk sac presents the appearance of a small pear-shaped opening ( traditionally called the " umbilical vesicle " ), into the digestive tube by a long narrow tube, the vitelline duct.
13.
After the coalescence of the neural folds over the anterior end of the primitive streak, the blastopore no longer opens on the surface but into the closed canal of the neural tube, and thus a transitory communication, the neurenteric canal, is established between the neural tube and the primitive digestive tube.
14.
It also forms the lining cells of all the glands which open into the digestive tube, including those of the liver and pancreas; the epithelium of the auditory tube and tympanic cavity; the trachea, bronchi, and air cells of the lungs; the urinary bladder and part of the urethra; and the follicle lining of the thyroid gland and thymus.
