part of contributes to morphology of composed primarily of pancreatic acinar cell exocrine pancreas pancreatic acinus FMA:16011 EMAPA:35651 pancreas acinus MA:0002417 SCTID:247604006 pancreatic acinar acinus pancreaticus NCIT:C49268 pancreatic acini The secretory units of the exocrine pancreas, where fluid containing digestive enzymes is produced; consists of a group of secretory cells surrounding a luminal space that connects to the pancreatic duct. pancreatic lobule serous acinus