The Journal of Physiological Sciences

, Volume 69, Issue 2, pp 253–262 | Cite as

Electrophysiological properties of Ia excitation and recurrent inhibition in cat abdominal motoneurons

  • Masatoshi NiwaEmail author
  • Ken Muramatsu
  • Kiyomi Nakayama
  • Sei-Ichi Sasaki
Original Paper


Ia excitation and recurrent inhibition are basic neuronal circuits in motor control in hind limb. Renshaw cells receive synaptic inputs from axon collaterals of motoneurons and inhibit motoneurons and Ia inhibitory interneurons. It is important to know properties of Ia excitation and recurrent inhibition of trunk muscle such as abdominal muscles. The abdominal muscles have many roles and change those roles for different kind of functions. Intracellular recordings were obtained from the abdominal motoneurons of the upper lumbar segments in cats anesthetized. First, dorsal roots were left intact, and sensory and motor axons were electrically stimulated. Ia excitatory post-synaptic potentials were elicited in five of eight motoneurons at same segment stimulated. Second, dorsal roots were sectioned, and motor axons were electrically stimulated. Recurrent inhibitory post-synaptic potentials were elicited in one of 11 abdominal motoneurons. Renshaw cells extracellularly fired high-frequency bursts at short latency and at same segment stimulated.


Abdominal motoneuron Ia-EPSP Recurrent IPSP Spinal cord Inhibition 



This study was supported by a KAKENHI grant (25350621) from the Japan Society for the Promotion of Science. We would also like to thank Editage ( for English language editing.

Author contributions

All co-authors participated in data collection and analysis. All co-authors have read and approved the final manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval

All experimental procedures were approved by the Animal Ethics Committee of Ibaraki Prefectural University of Health Sciences and were in accordance with the guiding principles for care and use of animals in the field of physiological sciences outlined by the Physiological Society of Japan.


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Copyright information

© The Physiological Society of Japan and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Occupational TherapyKyorin UniversityMitakaJapan
  2. 2.Department of Physical TherapyHealth Science UniversityFujikawaguchikoJapan
  3. 3.Department of Oral Physiology, School of DentistryShowa UniversityShinagawaJapan
  4. 4.Center for Medical SciencesIbaraki Prefectural University of Health SciencesInashikiJapan
  5. 5.Tokyo Public Health CollegeTokyoJapan

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