|   						  					  	  	  	  	enile erection is managed by two mechanisms: the reflex erection, which is achieved by directly touching the  	penile shaf 81wpj t, and the psychogenic erection, which is achieved by erot 1wpj ric or emotional stimuli. The former uses  	the peripheral nerves and the lowe 1wpj r parts of the j  spinal cord, whereas the latter uses the limb j ic system of th  	e brain. In both conditions, an intact neural system is required for a successful and complete erection. Stimu  	lation os wpj rtef the penile shaft by the nervous sys wpj rtem leads to the secret 81wpj ion of nitric oxide (NO), which causes the   	relaxation of smooth mu 1wpj rcles of corpora cavernosa (the main es wpj rterectile tissue of penis), and su 81wpj bsequently penile   	erection. Additionally, adequate levels of testosterone (produced by the testes) and an intact pituitary gland   	are required for the development of j a healthy erectile system. As can be unders pjrtestood from the mechanisms of a no  	rmal erectio pjn, 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 wpj rte indicate a proble 1wpj rm with nerve function or blood supply in the penis. There a 1wpj rre two methods for measuri  	ng changes in penile rigidity and circumference during s wpj rtenocturnal erecti pjon: snap gauge and strain gauge. A signifi  	cant proportion of men who have no se j xual dysfunction nonetheles  						 is similar to magnetic resonance imaging. Magnetic resonance angiography uses ma  						gnetic  81wpj fields and radio waves to j provide detailed images of the blood vessels. Doctors may in  						ject a "contrast agent" into the patient's bloodstream ths wpj rteat causes vascula 81wpj 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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