STUDIES ON HEMODYNAMICS OF ERECTION BY ELECTROSTIMULATION OF THE CAVERNOUS NERVES IN THE DOG

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  • イヌ陰茎海綿体神経叢の電気刺激による勃起時の血流動態の研究

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To study various aspects of penile erection, we created dog models by implanting electrodes around the cavernous nerves. The cavernous nerves, which are branches of the pelvic plexus, travel along the posterolateral aspect of the prostate to innervate the erectile tissue of the penis. We studied to evaluate the details of the hemodynamic changes of penile erection. The studies included: 1) internal pudendal arterial blood flow, 2) intrapenile blood flow, 3) corporeal pressure and 4) femoral blood pressure.<br>Immediate response to stimulation was an increase in blood flow in the internal pudendal arteries. The latent period lasted for approximately 10 to 20 seconds. The flow increase occurred in both systolic and diastolic phases. After the latent phase, intracorporeal pressure rapidly increased and approached the level of the diastolic blood pressure. When the full erection was achieved, the flow still remained above prestimulation level, although a gradual decrease in the flow was seen. Intrapenile blood flow was silightly decreased at the time of full erection, compared with that of non-erection. Tumescence of the corpora cavenosa was found to be a result of active relaxation of the sinusoidal spases and active arteriolar dilatation.

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