Corpus Cavernosum Penis Pressure and External Penile Muscle Activity During Erection in the Goat12

The corpus cavernosus penis (CCP) and electromyographic (EMG) activity of the external penile muscles were recorded during erection and ejaculation of the goat. The mean peak CCP pressures were 18, 83, and 7003 mm Hg for the quiescence, mild erection, and maximum erection stage of the penis. The contractions of the ischiocavernosus muscles (ICM) were in phase with the peak pressures of the CCP. Anesthesia of the ICM prevented the high peak CCP pressures, indicating that these muscles are the source of energy for the high pressure recorded.