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Related Concept Videos

Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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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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Spinal Cord: Cross-sectional Anatomy01:16

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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
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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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Overview of Somatic Sensory Pathways01:29

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
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Direct Motor Pathways01:11

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Cerebellum: Anatomical Regions

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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.
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Multiple Longitudinal Tracts in the Cephalopod Arm Sensorimotor System.

Cassady S Olson1, Clifton W Ragsdale2

  • 1Committee on Computational Neuroscience, University of Chicago, Chicago, Illinois, USA.

The Journal of Comparative Neurology
|May 6, 2026
PubMed
Summary
This summary is machine-generated.

Octopus arms coordinate movements via intrinsic neural connections within the axial nerve cord (ANC) and cerebrobrachial tract (CBT). These pathways enable complex arm and sucker behaviors across cephalopods.

Keywords:
Doryteuthis pealeiiEuprymna berryiOctopus bimaculoidesmuscular hydrostatneural circuitryneuroethologysensorimotor control

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Cephalopod Biology

Background:

  • Octopuses exhibit complex motor behaviors requiring coordinated arm and sucker movements.
  • The axial nerve cord (ANC) controls arm function, analogous to a vertebrate spinal cord.
  • The cerebrobrachial tract (CBT) connects arms to the brain, but intrinsic coordination pathways were unknown.

Purpose of the Study:

  • To investigate intrinsic longitudinal connections within the octopus arm's ANC.
  • To determine if these connections facilitate coordinated arm and sucker movements.
  • To compare these neural structures across cephalopod species.

Main Methods:

  • Tract-tracing techniques (DiI labeling, dextran tracing).
  • Immunohistochemistry.
  • Comparative analysis of octopus and squid ANCs.

Main Results:

  • The octopus ANC neuropil contains distinct longitudinal fiber tracts in both oral and aboral regions.
  • The CBT also carries arm-intrinsic longitudinal connections, with tracts specific to sucker or arm musculature.
  • A shared aboral, extra-neuropil tract was identified in both octopus and squid ANCs.

Conclusions:

  • The identified neural pathways provide the substrate for coordinated motor behaviors along cephalopod appendages.
  • Intrinsic longitudinal connections in the ANC and CBT are crucial for complex arm and sucker control.
  • These findings reveal conserved neural mechanisms for appendage coordination in cephalopods.