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Direct Motor Pathways01:11

Direct Motor Pathways

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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Stability, limb coordination and substrate type: the ecorelevance of gait sequence pattern in primates.

Journal of experimental zoology. Part A, Comparative experimental biology·2006
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The effect of branch diameter on primate gait sequence pattern.

Nancy Jeanne Stevens1

  • 1Department of Biomedical Sciences, College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, USA. stevensn@ohio.edu

American Journal of Primatology
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Primates often use diagonal sequence (DS) gaits, unlike most mammals. This study found no evidence that DS gaits offer an advantage on narrow branches, despite primates

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Area of Science:

  • Primate locomotion
  • Comparative biomechanics
  • Evolutionary biology

Background:

  • Most mammals exhibit lateral sequence gaits.
  • Primates commonly use diagonal sequence (DS) gaits, potentially linked to arboreal habitats.
  • The adaptive significance of DS gaits on varied substrates remains debated.

Purpose of the Study:

  • To investigate the relationship between branch diameter and gait patterns in strepsirrhine primates.
  • To test the hypothesis that DS gaits provide an advantage on narrow arboreal supports.

Main Methods:

  • Collected 360 strides from six species of quadrupedal strepsirrhine primates.
  • Compared gait patterns on broad and narrow diameter supports.
  • Quantified gait sequence using limb phase analysis.

Main Results:

  • Locomotor velocity was significantly reduced on narrower supports for some species.
  • No significant differences in limb phase (gait sequence) were observed between broad and narrow supports.
  • Gait alterations do not appear to be a primary adaptation for negotiating narrow branches.

Conclusions:

  • The study provides limited evidence supporting the advantage of DS gaits on narrow supports.
  • Alternative explanations for primate DS gait preference may be necessary.
  • Locomotor adjustments beyond gait sequencing are likely crucial for navigating complex arboreal environments.