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Hindlimb Representation in the Spiny Mouse Sensorimotor Cortex
Anton Beljajev1, Aleksandr Veshchitskii1, Aleksandr Mikhalkin1
1Pavlov Institute of Physiology RAS, Saint Petersburg, Russian Federation.
The Journal of Comparative Neurology
|August 8, 2026
Summary
This study maps the Cairo spiny mouse hindlimb sensorimotor cortex using retrograde tracing and immunohistochemistry. Findings reveal distinct cortical areas and interneuron variations, crucial for neuroscience research.
Area of Science:
- Neuroscience
- Neuroanatomy
- Mammalian Neurobiology
Background:
- The Cairo spiny mouse (Acomys cahirinus) is an emerging model in neuroscience research.
- A detailed neuroanatomical map of its cerebral cortex, particularly the sensorimotor cortex, is currently lacking.
- Understanding sensorimotor pathways is vital for various neurological studies.
Purpose of the Study:
- To delineate the location and internal subdivisions of the sensorimotor cortex controlling the hindlimb in the Cairo spiny mouse.
- To characterize the cytoarchitecture and specific neuronal populations within this region.
- To establish a foundational neuroanatomical map for future research.
Main Methods:
- Retrograde tracing from the lumbar spinal cord using Fast Blue.
- Immunohistochemical characterization with neuronal markers: NeuN, SMI-32, and calbindin.
- Analysis of labeled neurons, cytoarchitecture, and interneuron populations in adult spiny mice.
Main Results:
- Fast Blue-labeled neurons were identified in layer V of the hindlimb sensorimotor cortex.
- NeuN staining delineated cortical layers, while SMI-32 distinguished between lateral (somatosensory) and medial (motor) sub-areas.
- Calbindin-expressing interneurons showed significant interareal differences in soma size and density within layers III-IV.
Conclusions:
- This study provides the first detailed neuroanatomical map of the hindlimb sensorimotor cortex in the Cairo spiny mouse.
- The identified subdivisions and interneuron characteristics offer crucial insights into sensorimotor processing.
- This foundational map supports the use of spiny mice as a model for sensorimotor research.
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