Related Experiment Videos
Extensive cortical rewiring after brain injury.
Numa Dancause1, Scott Barbay, Shawn B Frost
1Department of Molecular and Integrative Physiology, The University of Kansas Medical Center, Kansas City, Kansas 66160, USA. ndancause@kumc.edu
Summary
Brain injury causes significant rewiring of neural connections. The ventral premotor cortex (PMv) forms new connections after primary motor cortex (M1) damage, suggesting remarkable adult central nervous system (CNS) plasticity.
Area of Science:
- Neuroscience
- Neuroanatomy
- Central Nervous System (CNS) Plasticity
Background:
- The ventral premotor cortex (PMv) shows neurophysiological changes after primary motor cortex (M1) injury.
- Understanding the anatomical reorganization of PMv is crucial for comprehending brain plasticity after injury.
Purpose of the Study:
- To investigate the cortical connections of the PMv following M1 injury.
- To determine if M1 lesions induce neuroanatomical remodeling in PMv.
Main Methods:
- Utilized biotinylated dextran amine (BDA) as a neuroanatomical tract tracer.
- Injected BDA into the PMv hand area in adult animals at least 5 months post-M1 ischemic injury.
- Compared labeling patterns between experimental and control subjects.
Main Results:
- Observed extensive proliferation of novel PMv terminal fields.
- Detected retrogradely labeled cells in the primary somatosensory cortex (area 1/2).
- Identified altered trajectories of PMv intracortical axons near the M1 lesion site.
Conclusions:
- M1 injury induces axonal sprouting and the formation of new PMv connections in distant targets.
- Cortical areas remote from the injury site undergo significant neuroanatomical reorganization after stroke-like injuries.
- The adult CNS exhibits substantial anatomical rewiring capacity, potentially contributing to functional recovery.