Park, Yong-Ki
(Department of Biological Sciences, College of Natural Science, Dankook University)
,
Gu, Hye-Yoon
(Department of Biological Sciences, College of Natural Science, Dankook University)
,
Kwon, Hyun-Jung
(Department of Biological Sciences, College of Natural Science, Dankook University)
,
Kim, Hoon
(Department of Biological Sciences, College of Natural Science, Dankook University)
,
Moon, Myung-Jin
(Department of Biological Sciences, College of Natural Science, Dankook University)
The characteristic features of the arachnid central nervous system (CNS) are related to its body segmentation, and the body in the Opiliones appears to be a single oval structure because of its broad connection between two tagmata (prosoma and opisthosoma). Nevertheless, structural organization of t...
The characteristic features of the arachnid central nervous system (CNS) are related to its body segmentation, and the body in the Opiliones appears to be a single oval structure because of its broad connection between two tagmata (prosoma and opisthosoma). Nevertheless, structural organization of the ganglionic neurons and nerves in the harvestman Leiobunum japonicum is quite similar to the CNS in most other arachnids. This paper describes the fine structural details of the main groups of neuropiles in the CNS ganglia revealed by the transmission electron microscopy. In particular, electron-microscopic features of neural clusters in the main neuroganglia of the CNS (supraesophageal ganglion, protocerebral ganglion, optic lobes, central body, and subesophageal ganglion) could provide indications for the nervous pathways associated with nerve terminations and plexuses. The CNS of this harvestman consists of a supraesophageal ganglion (brain) and a subesophageal mass, and there are no ganglia in the abdomen. Cell bodies of neuroganglia are found in the periphery, but central parts of the ganglia are mostly fibrous in all ganglia. Neuroglial cells occupy the spaces left by nerve cells. Since the nerve cells in the ganglia are typical composed of monopolar neurons, axons and dendrites of neurons are distributed along the same direction.
The characteristic features of the arachnid central nervous system (CNS) are related to its body segmentation, and the body in the Opiliones appears to be a single oval structure because of its broad connection between two tagmata (prosoma and opisthosoma). Nevertheless, structural organization of the ganglionic neurons and nerves in the harvestman Leiobunum japonicum is quite similar to the CNS in most other arachnids. This paper describes the fine structural details of the main groups of neuropiles in the CNS ganglia revealed by the transmission electron microscopy. In particular, electron-microscopic features of neural clusters in the main neuroganglia of the CNS (supraesophageal ganglion, protocerebral ganglion, optic lobes, central body, and subesophageal ganglion) could provide indications for the nervous pathways associated with nerve terminations and plexuses. The CNS of this harvestman consists of a supraesophageal ganglion (brain) and a subesophageal mass, and there are no ganglia in the abdomen. Cell bodies of neuroganglia are found in the periphery, but central parts of the ganglia are mostly fibrous in all ganglia. Neuroglial cells occupy the spaces left by nerve cells. Since the nerve cells in the ganglia are typical composed of monopolar neurons, axons and dendrites of neurons are distributed along the same direction.
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문제 정의
This study reveals fine structural characteristics of the neuroganglia in the CNS of the harvestman L. japonicum with aid of high resolution transmission electron microscopy. This opiliones have unique body structure comparing to other arachnids since their main body sections (prosoma and ophistosoma) are not separated.
가설 설정
(A) Photo micrograph of the subesophageal ganglion. (B) Cells in the subesophageal ganglia are restricted to the ventral and lateral regions. Nc, neuronal cell; Gc, neuroglial cells.
(C) Neuropiles of the optic nerve are consisted of the process of neurons and terminal arborizations. (D) Cell bodes, axons, and dendrites (dn) are distributed along the same direction. (E) Dendrites contain rough endoplasmic reticulum, free ribosomes and Golgi complex.
gi, Golgi complex; T, tracheole. (D) Motor neurons have peripheral dendrites (dn) as well as relatively large cell bodies. er, endoplasmic reticulum.
제안 방법
The purpose of the present investigation was to determine the electron-microscopic features of neurons and neuroglial cells in the CNS ganglia, as part of a wider investigation into the nervous centers and pathways associated with nerve terminations and plexuses. The application of electron microscopic techniques to the study of invertebrate CNS has revealed that the shape and arrangement and their connections with the brain and other ganglia suggest that they are associated with complex behavioral activities (Babu, 1985).
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