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Related Concept Videos

Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

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The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
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The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
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Diencephalon: Thalamus and Information Relay01:27

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Diencephalon: Hypothalamus and Coordination01:23

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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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Functional Brain Systems: Limbic System01:15

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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Brainstem: Control Centers of Medulla01:21

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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
Olivary Nucleus
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The thalamic reticular nucleus orchestrates social memory.

Feidi Wang1, Huan Sun2, Mingyue Chen3

  • 1Department of Anesthesiology and Perioperative Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China; Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China; Shaanxi Belt and Road Joint Laboratory of Precision Medicine in Psychiatry, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China.

Neuron
|May 3, 2024
PubMed
Summary

Parvalbumin-positive neurons in the sensory thalamic reticular nucleus are crucial for mice to remember familiar individuals. This study identifies a specific neural circuit essential for social memory formation and storage.

Keywords:
cortico-intrathalamic circuitmemory engramparafascicular thalamic nucleusposterior parietal cortexsingle-cell RNA sequencingsocial memorythalamic reticular nucleusthalamus

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Molecular Biology

Background:

  • Social memory is vital for survival and reproduction in many species.
  • The neural mechanisms underlying social memory are not fully understood.

Purpose of the Study:

  • To investigate the role of parvalbumin-positive neurons in the sensory thalamic reticular nucleus (sTRNPvalb) in social memory.
  • To elucidate the specific neural circuit involved in social memory formation.

Main Methods:

  • Inhibition of the posterior parietal cortex (PPC)CaMKII→sTRNPvalb→parafascicular thalamic nucleus (PF) circuit in mice.
  • Electrophysiological recordings and single-cell RNA sequencing of sTRNPvalb neurons.

Main Results:

  • Inhibition of the PPC→sTRNPvalb→PF circuit impaired the ability to discriminate familiar from novel conspecifics.
  • A specific subset of sTRNPvalb neurons with high excitability and complex dendritic structures was identified as crucial for storing social memory.
  • Single-cell RNA sequencing indicated robust protein synthesis activation in these memory-storing neurons.

Conclusions:

  • sTRNPvalb neurons are necessary and sufficient for social memory in mice.
  • A novel corticothalamic circuit involving sTRNPvalb neurons plays a key role in social memory.
  • These findings reveal the cellular and circuit basis of social memory engrams.