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Related Concept Videos

Organization of the Brain01:30

Organization of the Brain

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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.
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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...
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Cerebrum: Anatomical Overview II01:11

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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Cerebellum: Anatomical Regions01:17

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The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
Cerebellar Structure
Externally, the cerebellum features a highly convoluted surface with numerous folia (narrow ridges) separated by shallow sulci (grooves). The cerebellum is divided into two hemispheres by a thin median structure known as the vermis. The...
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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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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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Updated: Jul 15, 2025

Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
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Structure and function of neocortical layer 6b.

Dirk Feldmeyer1,2,3

  • 1Research Centre Jülich, Institute of Neuroscience and Medicine 10 (INM-10), Jülich, Germany.

Frontiers in Cellular Neuroscience
|September 25, 2023
PubMed
Summary
This summary is machine-generated.

Cortical layer 6b, a developmental remnant, is increasingly studied for its adult functions. This review details its neurons, connectivity, and neuromodulator responses, offering insights into neocortical function.

Keywords:
acetylcholinedopaminelayer 6bneocortexneuromodulationneurotensinorexin (hypocretin)synaptic connectivity patterns

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cortical Circuitry

Background:

  • Cortical layer 6b (L6b) is hypothesized as a subplate remnant from early development.
  • Its adult function and neuronal characteristics remain largely unexplored.
  • Recent attention is shifting towards elucidating L6b's role in the adult neocortex.

Purpose of the Study:

  • To review current knowledge on L6b excitatory and inhibitory neurons.
  • To explore L6b's pre- and postsynaptic connectivity and functional implications.
  • To discuss the influence of neuromodulators on L6b microcircuitry.

Main Methods:

  • Review of existing literature on L6b.
  • Analysis of neuronal types, connectivity, and functional roles.
  • Examination of responses to neuropeptides and neurotransmitters.

Main Results:

  • L6b comprises distinct excitatory and inhibitory neuronal populations.
  • Its connectivity patterns and functional roles are beginning to be understood.
  • L6b neurons exhibit unique responsiveness to neuromodulators like orexin, neurotensin, and acetylcholine.

Conclusions:

  • L6b plays a significant, yet underappreciated, role in adult neocortical function.
  • Understanding L6b microcircuitry and neuromodulation is crucial for comprehending cortical processing.
  • Further research into L6b offers insights into brain development and function.