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Neurobiology of Motor Actions – Abdel El Manira group
We are interested in understanding the complex processes by which the brain translates intentions into actions. Our particular focus lies on investigating neural circuits within the brainstem and spinal cord, which play a pivotal role in generating movements such as those enabling us to walk or run.
Part of the Department of Neuroscience
Photo: Stefan Zimmerman External website
El Manira Lab
We are interested in understanding how the brain transforms intentions into actions. An important task of the brain is to extract and process information from the outside world and to transform it into appropriate motor actions. The implementation of these motor actions is achieved through the action of neuronal circuits in the brainstem and spinal cord, which in turn activate precise sequences of limb and body muscles. The motor pathway – from brain to muscle – involves diverse neuron types that form functional circuits that endow animals with a repertoire of mental and motor faculties. A major goal of our laboratory is to decipher these neuronal circuits and to understand the principles underlying the versatility of motor actions. We have a special focus on neural circuits in the brainstem and spinal cord responsible for the generation of movements such as those enabling us to walk or run.
Our research
The goal of our research is to decipher the organizational logic together with the intricate coding and processing that allow the spinal network to produce locomotor movements with varying speed and force. To achieve this, our laboratory has pioneered the use of the adult zebrafish, which lends itself to a detailed experimental analysis using a variety of state-of-the-art tools.
Thus far, our studies have revealed the organization and pattern of recruitment of motoneurons and excitatory interneurons during swimming. Our recent results show that motoneurons are divided into four distinct pools with a somatotopic organization in the motor column depending on the type of muscle they innervate. These motoneuron pools represent discrete modules that are deployed incrementally with increasing swimming speed.
In addition, we have identified a class of excitatory interneurons as the substrate for the excitatory drive that endows the spinal network with the capacity to generate swimming.
Finally, we have uncovered a novel principle of organization of the spinal locomotor network consisting of ensembles of microcircuits that act as an intrinsic gearshift. Each microcircuit encompasses a subset of motoneurons and excitatory interneurons that are incrementally recruited to increase the swimming speed.
Image: Abdel El Manira
Thus, novel insights into the principles governing locomotor microcircuits organization and function are beginning to emerge from our studies that may have general implications beyond the study of circuits for motor behavior.
Principles governing recruitment of neurons during locomotion. At slow swimming speeds only slow microcircuits activating slow muscles are recruited. Fast microcircuits are deployed with increased speed and activate fast muscles.
Staff and contact
Group leader
- Abdel El ManiraProfessor
All members of the group
- Kinana AljaraidahTeaching Assistant
- Maria BertuzziResearch Engineer
- Elin DahlbergBiomedical Scientist
- Abdel El ManiraProfessor
- Song JianrenAffiliated to Research
- David Madrid PulgarínPhd Student
- Leander MrowkaPhd Student
- Irene PallucchiAffiliated to Research
- Laurence PictonAssistant Professor
- Vidur SabharwalPostdoctoral Studies
Contact and visit us
Contact information for the Abdel El Manira research group at the Department of Neuroscience, Karolinska Institutet.
Postal address
Department of Neuroscience
Karolinska Institutet, SE-171 77 Stockholm
Visiting address (visitors, couriers, etc.)
Karolinska Institutet, Biomedicum, 4B
Solnavägen 9, SE-171 65 Solna
Delivery address (goods, parcels, etc.)
Tomtebodavägen 16, SE-171 65 Solna