Background
He was born in Horten as a son of captain James Christian Jansen (1868–1912) and Ananda Kristine Jacobsen (1874–1961).
( The Comparative Anatomy and Histology of the Cerebellum...)
The Comparative Anatomy and Histology of the Cerebellum was first published in 1972. Minnesota Archive Editions uses digital technology to make long-unavailable books once again accessible, and are published unaltered from the original University of Minnesota Press editions. This is the third and final volume of the late Dr. Larsell's definitive work on the cerebellum, brought to completion for publication by Dr. Jansen. Two additional contributing authors for this volume are Enrico Mugnaini, M.D., and Helge K. Korneliussen, M.D. The first section of this volume deals with the morphology of the human cerebellum. The morphogenetic development, the fissure formation, and the differentiation of the cerebellar lobules are described in detail, and followed by a comprehensive account of the adult cerebellum, its lobes and lobules. It is shown that the ten major lobules which Dr. Larsell distinguished in other mammals are recognizable also in man. Chapters on the cerebellum connections include detailed accounts of all afferent and efferent cerebellar tracts. A subsequent chapter, by Drs. Jansen and Korneliussen, is devoted to the fundamental plan of cerebellar organization. The final chapters, by Dr. Mugnaini, deal with the histology and cytology of the cerebellar cortex. A comprehensive account is given of electron micrographs, a virtual atlas of the ultrastructure of the cerebellar cortex, illustrate the description.
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He was born in Horten as a son of captain James Christian Jansen (1868–1912) and Ananda Kristine Jacobsen (1874–1961).
He finished his secondary education in Horten in 1917 and studied at the Royal Frederick University, graduating with the candidate.med. He was hired as a prosector there in 1926, studied with a Rockefeller Grant under C. Judson Herrick at the University of Chicago from 1927 to 1929, and back in Norway he took the dr.med.
He played an important role in the Norwegian civil resistance during the Second World War. degree in 1924. degree in 1931 with the thesis The brain of Myxine glutinosa. He continued as a researcher at the University of Chicago, and was a professor from 1945 to 1966. He was the Europe-based editor for the Journal of Comparative Neurology.
Together with Alf Brodal he is credited with founding the "Oslo School" of brain research.
His research speciality was the cerebellum, but in addition to the human brain, Jansen did research on cetacean brains. He also did research in neuropathology and published textbooks in anatomy and histology, and published three books based on Olof Larssell"s work after Larssell died.
During the Second World War, Jansen participated in the Norwegian resistance movement from 1940 onwards. He had to flee to Sweden in 1944.
( The Comparative Anatomy and Histology of the Cerebellum...)
Norwegian Academy of Science and Letters]
He edited the illegal newspaper Bulletinen from 1941. From 1942 to 1944 as the sole editor, and was a member of the so-called Coordination Committee (Norwegian: Koordinasjonskomiteen (KK)). In 1961 Jansen stood forward as a member of Landsforbundet for folkeavstemning, a lobby organization which worked to include the institution of referenda in the Norwegian Constitution.
He was a member of the Norwegian Academy of Science and Letters, and an honorary doctor of the University of Kiel, the University of Leiden and the University of Århus.