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Related Concept Videos

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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Somatosensory, Motor, and Association Cortex01:23

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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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Somatosensation01:33

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Indirect Motor Pathways01:22

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Related Experiment Video

Updated: Feb 20, 2026

Author Spotlight: Unveiling Neural Coding and Mechanisms of Visual Processing in the Superior Colliculus
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A Layer-specific Corticofugal Input to the Mouse Superior Colliculus.

Hector Zurita1, Crystal Rock1, Jessica Perkins1

  • 1Department of Biology, Neuroscience Institute, University of Texas at San Antonio, San Antonio, TX, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|October 28, 2017
PubMed
Summary
This summary is machine-generated.

Pyramidal neurons in the auditory cortex (AC) project to the superior colliculus (SC). Layer 5 neurons act as bandpass filters, while layer 6 neurons act as low-pass filters, due to differences in the h-current.

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Area of Science:

  • Neuroscience
  • Auditory System Research
  • Cortical Circuitry

Background:

  • Corticofugal projections from the auditory cortex (AC) modulate ascending auditory information.
  • The AC influences superior colliculus (SC) neuronal responses via descending projections.
  • The specific roles of different pyramidal neuron types in AC-SC projections remain unclear.

Purpose of the Study:

  • To investigate the laminar distribution, projection targets, and electrophysiological properties of pyramidal neurons projecting from the AC to the SC in mice.
  • To elucidate the functional differences between layer 5 and layer 6 pyramidal neurons in AC-SC pathways.

Main Methods:

  • Utilized anterograde and retrograde neuronal tracing techniques in the mouse brain.
  • Examined the laminar distribution and long-range projections of AC pyramidal neurons.
  • Characterized the electrophysiological properties, including subthreshold responses and the role of the h-current (Ih).

Main Results:

  • Layer 5 cortico-superior-collicular pyramidal neurons function as bandpass filters, with peak resonance around 3 Hz.
  • Layer 6 cortico-superior-collicular pyramidal neurons exhibit low-pass filter properties.
  • Differences in the hyperpolarization-activated cyclic nucleotide-gated cation h-current (Ih) underlie the distinct subthreshold properties of layer 5 and layer 6 neurons.
  • Ih differentially dampens synaptic input summation in layer 5 compared to layer 6 neurons.

Conclusions:

  • Layer 5 and layer 6 pyramidal neurons in the AC possess distinct intrinsic properties that shape their output to the SC.
  • The h-current plays a crucial role in mediating these functional differences, impacting how neurons process and transmit information.
  • These findings reveal a novel layer-specific mechanism for modulating information flow within the auditory corticocollicular pathway.