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Related Concept Videos

Somatosensation01:33

Somatosensation

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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Related Experiment Video

Updated: May 8, 2026

Compensatory Limb Use and Behavioral Assessment of Motor Skill Learning Following Sensorimotor Cortex Injury in a Mouse Model of Ischemic Stroke
08:01

Compensatory Limb Use and Behavioral Assessment of Motor Skill Learning Following Sensorimotor Cortex Injury in a Mouse Model of Ischemic Stroke

Published on: July 10, 2014

Callosal disconnection and limb-kinetic apraxia.

L M Acosta1, J A Bennett, K M Heilman

  • 1a Department of Neurology , University of Florida College of Medicine , Gainesville , FL , USA.

Neurocase
|August 27, 2013
PubMed
Summary
This summary is machine-generated.

A patient with a corpus callosum lesion developed left-hand apraxia, suggesting the left hemisphere is crucial for fine motor control of the left hand. This finding challenges previous assumptions about hemispheric dominance for limb dexterity.

Keywords:
Corpus callosumDisconnectionIdeomotor apraxiaLimb-kinetic apraxiaSeptum pellucidum

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Science

Background:

  • Limb-kinetic apraxia (LKA) involves impaired upper limb dexterity.
  • Previous research indicated left hemisphere lesions cause ipsilesional LKA in right-handed individuals, while right hemisphere lesions do not.

Observation:

  • A patient with a septum pellucidum cyst underwent surgery, resulting in a lesion in the mesial corpus callosum.
  • Post-surgery, the patient exhibited limb-kinetic and ideomotor apraxia in the left hand, but not the right.

Findings:

  • The case demonstrates a callosal disconnection LKA in the left hand following a corpus callosum lesion.
  • This suggests that the left hemisphere's motor or premotor cortex may facilitate the right hemisphere's motor system for programming fine left-hand movements.

Implications:

  • This finding provides novel insights into interhemispheric communication and motor control pathways.
  • It highlights the left hemisphere's significant role in mediating fine motor skills of the contralateral hand, challenging established models.