<prompt> T cell migration occurs to tonsil occurs at intrauterine age of:6 - 7 weeks10 - 11 weeks14 - 15 weeks18 - 19 weeks  <response>: Ans: d 18-19 wksRef: Human Embryology by I B Singh, 8th edi., Pg. 147IU ageDevelopmental events4 weeks2 lateral lingual swellings tuberculum impar5 weeksHypobranchial eminence6 weeksDental lamina of upper lower jaw7 weeksSalivary glands8 weeksEnamel organs3 monthsFormation of tonsil5 monthsTonsil infiltrated by lymphatic tissue6 monthsTongue formation complete 