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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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 posterior columns...
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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...
Cerebrum: Anatomical Overview I01:26

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The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...
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Embodied cognitive evolution and the cerebellum.

Robert A Barton1

  • 1Evolutionary Anthropology Research Group, Department of Anthropology, Durham University, Dawson Building, South Road, Durham DH1 3LE, UK. r.a.barton@durham.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|June 27, 2012
PubMed
Summary
This summary is machine-generated.

The cerebellum, not just the neocortex, played a key role in cognitive evolution. Its expansion correlates with complex behaviors like tool use and language, challenging traditional views of brain evolution.

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • Cognitive evolution research often focuses on neocortex expansion.
  • The cerebellum, despite its size, contains significantly more neurons than the neocortex.
  • Traditional comparative measures may underestimate the cerebellum's evolutionary significance.

Purpose of the Study:

  • To re-evaluate the cerebellum's role in cognitive evolution.
  • To investigate the correlated evolution of the neocortex and cerebellum.
  • To explore the cerebellum's contribution to complex behaviors such as tool use and language.

Main Methods:

  • Comparative analysis of brain structures, accounting for connectivity scaling.
  • Examination of neocortex and cerebellum size and neuron counts across species.
  • Integration of findings with studies on ape foraging, social learning, and cerebellar cognitive neuroscience.

Main Results:

  • Common measures like neocortex ratio underestimate cerebellar contribution to brain evolution.
  • A general pattern of correlated evolution between the neocortex and cerebellum is observed after accounting for connectivity scaling.
  • A relative expansion of the cerebellum is noted in apes and extractive foragers.

Conclusions:

  • The cerebellum is crucial for the evolution of planning, execution, and understanding of complex behaviors, including language.
  • Cognitive evolution is better understood as the development of specialized systems for embodied adaptive control, rather than distinct executive functions.
  • The sensory-motor and cognitive specializations are not clearly separated in the cerebellum's role in complex skills.