Spleen develops from ?: (A) Ventral mesogastrium, (B) Dorsal mesogastrium, (C) Hindgut mesentery, (D) Midgut mesentery
Answer is B. Spleen develops in cephalic pa of dorsal mesogastrium from its left layer during 6th week of intrauterine life into a number of nodule which soon fuse to form a lobulated spleen.Notching of superior border is an evidence of its multiple origin.The nodules which fail to fuse form accessory/supernumerary -spleen or spleniculi.These may be found at :i) Hilum of spleen (most common site).ii) Tail of pancrease.iii) Derivatives ofdorsal mesogastrium :- Greater omentum, gastrophrenic ligament, gastrosplenic ligament, linorenal ligament.iv) Broad ligament of uterus (in males) and spermatic cord (in female); both left side.