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. 2015 Sep 2;9:349. doi: 10.3389/fncel.2015.00349

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Copyright © 2015 Durand, Filipchuk, Pambo-Pambo, Amendola, Kulagina and Guéritaud.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Electrophysiological identification and intracellular staining of lumbar motoneurons in the developing mouse spinal cord. (A) Electrical stimulation of the fifth lumbar (L5) ventral root evoked an anti AP. Asterisk indicates the stimulus artifact. (B) Direct intracellular stimulation of L5 motoneuron giving rise to a train of action potentials (APs; sustained discharge) recorded intracellularly (upper trace) and the propagated spikes in the ventral root (lower trace); rectangular injected current: 1.2 nA (middle trace). (C,D), two fully reconstructed lumbar motoneurons recorded from P8–P9 mice. Depending on the location of the soma in the ventro-lateral part of the spinal cord, dendritic arborisations extended either in all rostro-caudal directions and medially near the central canal (C) or confined in a restricted area into the latero-ventral part of the spinal cord (D). (E,F) Digitized full reconstructions of two motoneurons at postnatal days 3 and 8 (P3 and P8) in the transverse plane. During this period, the total dendritic length increases by 22%, only. Each dendrite is represented by a specific color.