<prompt> Ganglia spared in lumbar sympathectomy -L1L2L3L4  <response>: Ans. is a i.e., LI If unilateral sympathectomy is done, LI L2, L3 and L4 ganglia needs removal for sympathetic denervation of lower limb. If bilateral sympathectomy is done, on one side LI ganglion is to be preserved otherwise patient will develop impotence. 