Rhythmic motor patterns accompanying ejaculation in spinal cord-transected male rats

Area of Science:

• Neuroscience
• Physiology
• Urology

Background:

• The ejaculatory response is a complex reflex mediated by a central pattern generator in the spinal cord.
• Rhythmic motor activity in specific muscles is crucial for the expulsion of seminal secretions.

Purpose of the Study:

• To investigate the role of the spinal pattern generator in controlling ejaculatory motor patterns.
• To determine if muscles beyond the bulbospongiosus are involved in the ejaculatory reflex.

Main Methods:

• Ejaculation was induced in spinal cord-transected male rats via urethral mechanical stimulation.
• Rhythmic motor patterns were recorded in the cremasteric, iliopsoas, and pubococcygeus muscles.
• Motor activity was compared to that recorded in the bulbospongiosus muscles.

Main Results:

• Similar rhythmic motor parameters were observed across the cremasteric, iliopsoas, pubococcygeus, and bulbospongiosus muscles during ejaculation.
• The study successfully elicited ejaculation and recorded associated muscle activity in a transected rat model.

Conclusions:

• The cremasteric, iliopsoas, and pubococcygeus muscles display rhythmic motor behavior during ejaculation.
• These findings suggest that the spinal pattern generator for ejaculation may also control these additional muscles.