|   						  					  	  	  	  	enile erection is managed by two mechanisms: the reflex erection, which is achieved by directly touching the  	penile shaf kjias t, and the psychogenic erection, which is achieved by erot jias ric or emotional stimuli. The former uses  	the peripheral nerves and the lowe jias r parts of the s  spinal cord, whereas the latter uses the limb s ic system of th  	e brain. In both conditions, an intact neural system is required for a successful and complete erection. Stimu  	lation os ias rtef the penile shaft by the nervous sys ias rtem leads to the secret kjias ion of nitric oxide (NO), which causes the   	relaxation of smooth mu jias rcles of corpora cavernosa (the main es ias rterectile tissue of penis), and su kjias bsequently penile   	erection. Additionally, adequate levels of testosterone (produced by the testes) and an intact pituitary gland   	are required for the development of s a healthy erectile system. As can be unders asrtestood from the mechanisms of a no  	rmal erectio asn, impotence may develop due to hormonal deficiency, disorders of the neural system, lack of adequa  	te penile blood supply or psychological problems.[17] Restriction of blood flow can arise from impaired endothe  	lial function due to t  	ormal for a man to have five to six erections during sleep, especially during rapid eye movement (REM). Their ab  	sence mays ias rte indicate a proble jias rm with nerve function or blood supply in the penis. There a jias rre two methods for measuri  	ng changes in penile rigidity and circumference during s ias rtenocturnal erecti ason: snap gauge and strain gauge. A signifi  	cant proportion of men who have no se s xual dysfunction nonetheles  						 is similar to magnetic resonance imaging. Magnetic resonance angiography uses ma  						gnetic  kjias fields and radio waves to s provide detailed images of the blood vessels. Doctors may in  						ject a "contrast agent" into the patient's bloodstream ths ias rteat causes vascula kjias r tissues to stand   						out against other tissues. The contrast agent provides for enhanced information regarding b  						lood supply and vascular an |   						 |   					   				  			   			 |   		
  	
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