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36. Observations on the Development of the Sympathetic Nervous System and Suprarenal Bodies in the Sparrow.
Author(s) -
Rau A. Subba,
Johnson P. H.
Publication year - 1923
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1096-3642.1923.tb02205.x
Subject(s) - primordium , neural crest , anatomy , biology , sympathetic ganglion , neuroscience , embryo , microbiology and biotechnology , biochemistry , gene
Summary.1 The primary sympathetic primordia originate from the apinal cord, and are hence ectodermal in origin. 2 The primordia of the ganglin of the primary sympathetic chain are laid down metamerically at inter‐somitic points. 3 The constituent cells of the primordia are derived froma. The neural crest; b. The dorsal root ganglia; c. The neural tube by way of the ventral root.4 The primordia extend cranially and candally to form a continuous chain on either side. 5 The primaly ganglionic swellings extend dorso‐laterally. The free ends of these extensions enlarge and becoming separated from the primary ganglia give origin to the definitive Sympathetic ganglia. 6 As in the case of the primary ganglia these definitive ganglis extend cranio‐caudally and unite to form a continuous chain. 7 The primary sympathetic gives origin to a. The secondary sympathetic chains; b. The chromaffin cells of the medulla of the suprarend body; c. The cœliac and other ganglia; d. The unpaired ganglia in the cervical region.