Electron microscopy of the endocrine pancreas of cattle (Bos taurus L.).
The electron-microscopic structure of the islets of Langerhans in cattle is studied. Four cell types are described: A, B, C and D, differing mainly in the structure of specific granules. In the A cells half-moon- or ring-shaped mitochondria are observed. Two modes of islet cell secretion are observed: by means of 'active-releasing sector's and emiocytosis.
D000818:Animals; D002417:Cattle / Q000033:anatomy & histology*; D002467:Cell Nucleus / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D007515:Islets of Langerhans / Q000378:metabolism / Q000648:ultrastructure*; D008928:Mitochondria / Q000648:ultrastructure