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Development of the sensory component of the respiratory mechanism of the toadfish ( Opsanus tau )
Author(s) -
Carroll Tracy Henry,
Hogg Ira D.
Publication year - 1968
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901330409
Subject(s) - biology , sensory system , neuroscience , anatomy , mechanism (biology) , cranial nerves , toadfish , physics , quantum mechanics , fishery , fish <actinopterygii>
This communication deals chiefly with the development of the sensory nerves that supply the portion of the head involved in respiration. It is a supplement to a previous paper (Tracy,′61) and describes in detail the origin of cells that form the sensory ganglia of four cranial nerves, V. VII, IX and X, together with their distribution, the branches that degenerate, motor distribution, and the time at which evidence of first motor movements controlled by them appears. It covers the details concerning the position of placodes which are the source of some of the cells from which the ganglia of these nerves are derived and the relative time at which they appear. In this article more emphasis is placed on the development of cranial nerves V and VII than on IX and X. Apparently the former two nerves are more involved in the mechanism of respiration than the latter two. Some incidental observations of importance are recorded that do not appear to bear particularly on the main thesis of the article. One of these concerns the paths of migration followed by the ectomesenchyme. Another statement is to the effect that the two kinds of mesenchyme do not mix but that a quite definite boundary region can usually be distinguished between them as if the process of differentiation has made them slightly incompatible.