Abstract
AbstractHistologic studies of pancreatic tissues of one pygmy sperm whale, Kiogia breviceps, and one dwarf sperm whale, K. simus, demonstrated rather typical exocrine pancreatic anatomy. Peroxidase‐antiperoxidase (PAP) techniques determined that the cell composition of the islets of Langerhans resembled that of other mammals. Within islets, cells secreting insulin (B‐cells) and glucagon (A‐cells), were clearly demonstrated, but, surprisingly, isolated A‐ and B‐cells were also found among pancreatic acinar cells. PAP techniques demonstrated the presence of neuron‐specific enolase within islets, but failed to provide a sufficiently clear reaction to demonstrate the presence of somarostatin‐producing D‐cells. No positive PAP reaction for serotonin occurred.
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