Somato-vesical reflexes in chronic spinal cats.

Area of Science:

• Neuroscience
• Urology
• Physiology

Background:

• The bladder's function is modulated by sensory input from various body parts.
• Understanding somato-vesical reflexes is crucial for bladder control research.

Purpose of the Study:

• To investigate the effects of hindlimb afferent nerve volleys on bladder function.
• To characterize somato-vesical reflexes in both intact and chronic spinal cats.

Main Methods:

• Electrophysiological recordings of pelvic nerve activity in response to hindlimb nerve stimulation.
• Experiments conducted on anesthetized, CNS-intact, and chronic spinal cats.
• Analysis of reflex components and their latencies.

Main Results:

• In chronic spinal cats, hindlimb afferent volleys (group III and IV) induced excitatory somato-vesical reflexes (increased bladder tone) and inhibitory somato-vesical reflexes (inhibited micturition contractions).
• In CNS-intact cats, distinct reflex components (A1-, A2-, and C-reflexes) with varying latencies were observed, triggered by different hindlimb afferent fiber groups (II, III, and IV).
• Specific reflexes were more prominent during bladder contractions than during quiet or empty states.

Conclusions:

• Somato-vesical reflexes play a significant role in modulating bladder tone and contractility.
• Different afferent pathways contribute to distinct components of the somato-vesical reflex, with varying latencies.
• The study elucidates the central pathways and physiological significance of these reflexes in bladder control.