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Related Concept Videos

Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Functional Divisions of the Nervous System01:23

Functional Divisions of the Nervous System

The nervous system, responsible for sensing, integrating, and responding to various stimuli, is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS has two functional divisions: the sensory or afferent division and the motor or efferent division.
The sensory division transmits information from sensory receptors in the body to the CNS. It provides the CNS with knowledge about somatic senses (such as tactile, thermal, pain, and proprioceptive sensations)...
Organization of the Brain01:30

Organization of the Brain

The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
Spinal Cord: Cross-sectional Anatomy01:16

Spinal Cord: Cross-sectional Anatomy

The cross-sectional anatomy of the spinal cord offers a detailed view of its complex structure and function within the central nervous system. At the core of the spinal cord lies the gray matter, characterized by its butterfly or "H"-shaped appearance in cross-section. This central region is enveloped by white matter, with the overall structure divided into symmetrical halves by the dorsal median sulcus and the ventral median fissure.
Gray Matter and its Components
Central to the gray matter is...
Neuronal Communication01:28

Neuronal Communication

Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...

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Updated: Jun 10, 2026

Recording and Analyzing Multimodal Large-Scale Neuronal Ensemble Dynamics on CMOS-Integrated High-Density Microelectrode Array
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Recording and Analyzing Multimodal Large-Scale Neuronal Ensemble Dynamics on CMOS-Integrated High-Density Microelectrode Array

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Distributed control circuits across a brain-and-cord connectome.

Alexander S Bates1,2, Jasper S Phelps3,4, Minsu Kim5,6,7

  • 1Department of Neurobiology, Harvard Medical School, Boston, MA, USA. Alexander_Bates@hms.harvard.edu.

Nature
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

Scientists mapped the fruit fly connectome, revealing how local sensory feedback loops and long-range circuits control body movements and organ function. This brain architecture is distributed and parallelized, similar to engineered systems.

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In Vivo Wireless Optogenetic Control of Skilled Motor Behavior
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In Vivo Wireless Optogenetic Control of Skilled Motor Behavior
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In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

Published on: November 22, 2021

Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Connectomics

Background:

  • Connectomes, or neural maps, are revolutionizing neuroscience, akin to genomes in molecular genetics.
  • Previous complete connectomes were limited to simpler organisms (worms, sea squirts, comb jellies) with far fewer synapses than insects.
  • The fruit fly possesses a complex brain (10^8 synapses) supporting learning and memory, with a ventral nerve cord analogous to the vertebrate spinal cord.

Purpose of the Study:

  • To report the first densely-reconstructed adult fruit fly connectome, integrating brain and ventral nerve cord data.
  • To investigate the principles of neural control within this complex nervous system.
  • To understand how neural circuits govern behavior and physiological processes.

Main Methods:

  • Densely reconstructing the complete adult fruit fly connectome, linking brain and ventral nerve cord.
  • Analyzing neural circuits to identify effector neuron influences and feedback loops.
  • Investigating the role of ascending and descending neurons in coordinating movements and organ function.

Main Results:

  • Effector neurons are primarily controlled by local sensory feedback loops within the same body part.
  • Long-range circuits, composed of ascending and descending neurons, link these local loops into behavior-centric modules.
  • Individual neurons can influence multiple body parts' voluntary movements and associated endocrine/visceral functions.
  • Brain regions for learning and navigation appear to supervise these control circuits.

Conclusions:

  • The fruit fly nervous system exhibits a distributed, parallelized, and embodied architecture.
  • This architecture is reminiscent of sophisticated control systems found in engineered applications.
  • The findings provide fundamental insights into neural control principles in a complex organism.