<prompt> At 30 days of intrauterine lifeHea stas beatingCerebellum developsOptical vesicle appearsPinna appears  <response>: Optical vesicle come in contact with surface ectoderm and lens place is forming by the 4th week of IUL - the eyes begin to develop as a pair of diveicula from the lateral aspects of the forebrain. These diveicula make their appearance before the closure of the anterior end of the neural tube; after the closure of the tube, they are known as the optic vesicles. Ear pinna or auricle stas forming by the 5th week of IUL Cerebellum stas forming by the 8th week of IUL The babys heabeat stas as the blood flow begins by 22nd day of IUL Reference: I B Singhs Embryology, 10th edition, pg 374, 281 