Normal and abnormal development of motor behavior: lessons from experiments in rats

Area of Science:

• Neuroscience
• Developmental Biology
• Comparative Neurology

Background:

• Motor behaviors initially develop via local spinal cord circuits, independent of descending projections.
• Postural control development appears critical for motor behavior maturation in both humans and rats post-birth.
• The cerebellum is strongly implicated in the development and control of motor behaviors.

Purpose of the Study:

• To review neural and behavioral development in humans and rats.
• To examine the consequences of central and peripheral nervous system lesions at various developmental stages.
• To explore the brain's compensatory mechanisms following nervous system injury.

Main Methods:

• Review of existing literature on neural and behavioral development.
• Analysis of the effects of central nervous system (CNS) and peripheral nervous system (PNS) lesions.
• Comparative analysis between human and rat models.

Main Results:

• Early CNS lesions disrupt fundamental neural development processes like fiber connection formation and cell death.
• Functional outcomes of CNS lesions are highly dependent on the developmental stage at the time of injury.
• The young, intact CNS exhibits a greater capacity for compensating abnormal PNS reinnervation compared to the adult CNS.
• The cerebellar cortex may be crucial for compensatory mechanisms in the peripheral nervous system.

Conclusions:

• Developmental stage significantly influences the impact of nervous system lesions on motor function.
• The cerebellum's role in motor control and compensation warrants further investigation.
• Understanding these developmental and compensatory processes may offer new therapeutic strategies for nervous system injuries.