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Spinal monoaminergic systems: an aspect of somatic motor function
Federation Proceedings
|November 1, 1981
Summary
Monoamines in the spinal cord ventral horn act as neuromodulators, influencing neuronal control of limbs. Experiments show selective effects on interneurons and motoneurons, particularly gamma motoneurons, highlighting their complex physiological roles.
Area of Science:
- Neuroscience
- Spinal Cord Physiology
- Neurochemistry
Background:
- Monoaminergic terminals are present in the spinal cord ventral horn.
- Monoamines are known neurotransmitters with potential neuromodulatory functions.
- Understanding their role is crucial for limb control and neurological function.
Purpose of the Study:
- To review monoaminergic terminal types in the ventral horn.
- To elucidate the physiological effects of monoamines on spinal cord neurons.
- To investigate the neuromodulatory role of monoamines in limb control.
Main Methods:
- Synopsis of existing literature on monoaminergic systems.
- Experimental investigation of monoamine effects on interneurons and motoneurons.
- Selective depletion of 5-hydroxytryptamine (5-HT) to assess gamma motoneuron activity.
Main Results:
- Monoamines exert selective physiological effects on interneurons, alpha motoneurons, and gamma motoneurons.
- Gamma motoneuron activation was observed in spinal cords partially depleted of 5-HT, demonstrating selectivity.
- Dopamine (DA), norepinephrine (NE), and 5-HT may mediate the effects of dihydroxyphenylalanine (DOPA).
Conclusions:
- Monoamines function as neuromodulators in the ventral horn, contributing to neuronal control of limbs.
- Evidence supports the presence and physiological significance of dopaminergic nerves in the spinal cord.
- Further research is needed to fully understand the neurochemical basis and implications of these findings.