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Termination of the afferent fiber in the spinal cord of the turtle Testudo horsfieldi and three-dimensional reconstruction of the sensory-motoneuron connection

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Cell and Tissue Biology : Volume 2, Issue 4, August 2008

Cell and Tissue Biology : Volume 2, Issue 3, June 2008

Cell and Tissue Biology : Volume 2, Issue 2, April 2008

Cell and Tissue Biology : Volume 2, Issue 1, February 2008

Cell and Tissue Biology : Volume 1

Termination of the afferent fiber in the spinal cord of the turtle Testudo horsfieldi and three-dimensional reconstruction of the sensory-motoneuron connection

Content Provider	Springer Nature Link
Author	Chmykhova, N. M. Karamian, O. A. Kozhav, V. M. Clamann, H. P. Vesselkin, N. P.
Copyright Year	2008
Abstract	Horseradish peroxidase (HRP) tracing methods and subsequent computer reconstruction were used to study the structural organization of sensory-motoneuron connections in turtles. HRP was applied through suction electrodes to thin dorsal and ventral root filaments of superfused isolated lumbar spinal cord of the turtle Testudo horsfieldi. Single motoneurons were labeled ionophoretically with intracellular glass microelectrodes. Labeled elements were examined under a light microscope. The Eutectic neuron tracing system and its associated program were used for three-dimensional reconstructions and morphometry. The distribution of afferent fibers of the dorsal root and their terminations were presented in a new scheme in which new zones, in addition to those that were already well known, were shown, including the following: in the Lissauer zone, motor nuclei, and ventrolateral funiculus, as well as in the contralateral medial gray matter (laminae IV–V). Unlike in frogs, the motoneuron dendritic field in turtles was restricted to an ellipsoid space with a short axis in the rostrocaudal direction (300–500 µm). The afferent fibers of the dorsal root connected to motoneurons produced very short branches in a restricted rostrocaudal direction (50–70 μm). One fiber collateral of the dorsal root had about 80 synapse-like enlargements (approximately tenfold fewer than in frogs). Putative sensory-motoneuron contacts were found on the I–VII-order dendritic segments of the dorsal and ventro-medial dendritic trees. It was shown that, in turtles, only one first-order collateral of the dorsal root fiber participated in the sensory-motoneuron connection with a small number (about 4) of putative contacts, which is also one order less than in frogs. It is likely that the simplification of the synapse structure in turtles is compensated by a higher efficiency of the signal transmission comparable to that in mammals.
Starting Page	504
Ending Page	515
Page Count	12
File Format	PDF
ISSN	1990519X
Journal	Cell and Tissue Biology
Volume Number	2
Issue Number	5
e-ISSN	19905203
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-10-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	spinal motoneurons afferent fibers of the dorsal root horseradish peroxidase three-dimensional reconstruction sensory-motoneuron connection turtle Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology

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