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| Content Provider | Springer Nature Link |
|---|---|
| Author | Lagutenko, Yu. P. |
| Copyright Year | 2004 |
| Abstract | Based on previously obtained data on structural organization and evolution of neuropil in annelids and phoronids, reconstruction of their internal apparatus has been performed. Four structural types are identified: the first—the initial, the most primitive state characteristic of neuropil of articulates (polychaetes with intraepidermal nervous system); the second—peculiar to neuropil of polychaetes in the beginning of the exit of the nervous system from epidermis; the third—the specific state of neuronal interrelations in leeches, when the internal apparatus contains no local interneurons, but is formed by intensive local arborization of associative neurons with intersegmental connections; the fourth—the initial state of the internal apparatus peculiar to Tentaculata, which is structurally incomparable with that in the primitive articulates. It has been shown that the initial state of neuronal structure of the internal apparatus of primitive polychaetes oweniids and phoronids, although has externally similar basiepidermal position, is incomparable architectonically. Therefore, at present, determination of the internal apparatus can be achieved only in general as a system of local interneurons, which provides to an extent of precision the afferent—efferent connections in neuropil and contributes to integration of these connections with the cerebropetal and cerebrofugal pathways. Complication of the internal apparatus structure in jointed Trochozoa with the ganglionic type of the nervous system has its own specific features. Four levels of its differentiation have been identified: (1) start of exit of the abdominal ganglion from epidermis (polychaetes nephthyds); (2) complete or partial exit of the nervous system form epidermis (most of polychaetes, oligochaetes); (3) replacement of local interneurons of the internal apparatus by a morphologically rearranged system of intersegmental associative neurons of the functionally similar nature (with exception of leeches, this process is typical to different extent of crustacean and arachnids); (4) intensive development of the system of local interneurons, which is peculiar to the internal apparatus of insects. |
| Starting Page | 671 |
| Ending Page | 682 |
| Page Count | 12 |
| File Format | |
| ISSN | 00220930 |
| Journal | Journal of Evolutionary Biochemistry and Physiology |
| Volume Number | 40 |
| Issue Number | 6 |
| e-ISSN | 16083202 |
| Language | English |
| Publisher | Nauka/Interperiodica |
| Publisher Date | 2004-01-01 |
| Publisher Place | Moscow |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Biochemistry Evolutionary Biology Animal Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Biochemistry Ecology, Evolution, Behavior and Systematics |
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