part of develops from ends during starts during alimentary system pancreas UBERON:0001264 XAO:0000136 xenopus_anatomy Internal gland organ with distinct tissues with different endocrine and exocrine functions. Its rudiment has three parts, one dorsal and two ventral primordia. The ventral can be first detected at NF stage 37/38. The dorsal is clearly segregated from the duodenal wall by NF stage 39. At NF stage 40 the right and left primordia have fused just above the gastro-duodenal vein. At NF stage 42 blood vessels penetrate into the crevices between the pancreatic acini making them more conspicuous. death dorsal pancreatic bud ventral pancreatic bud viscus compound organ NF stage 39