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* Bull,Ram and Boar
 
* Bull,Ram and Boar
* Involves increased blood flow with subsequent increase in pressure and simultaneous relaxation of the '''retractor penis muscle'''.
+
* Involves increased blood flow with subsequent increase in pressure and simultaneous relaxation of the '''retractor penis muscles'''.
 +
* Erection and protrusion involve straightening of the penis to eliminate the '''sigmoid flexure'''.
    
== Erection of the Musculovascular Penis ==
 
== Erection of the Musculovascular Penis ==
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