The 4 MAIN parts of the heart are the right atrium, left atrium, right ventricle and left ventricle.lood then flows through the  mitral valve into the left ventricle.   The left ventricle contracts to pump the blood out through  the aortic valve into the aorta (a large expandable  artery), from which blood flows out into the other arteries. . + 180 others found this useful. Lisa Frost.
Peroneal tendinitis is usually caused by repetitive use of the tendons, but can also be caused by trauma such as a rolled or sprained ankle. Little tears in the peroneus longus tendon and the peroneus brevis tendon irritate the tendon fibers resulting in pain and inflammation.
1 If perineum pain is the result of prostatitis, treatment for that condition may help with the pain. 2  For example, alpha blockers used to treat prostatitis may lesson the symptoms, such as painful urination or a swollen perineal region. 3  Corticosteroids.he perineum consists of muscle and tissue that can become swollen or painful due to sports injuries or medical causes. Several things can cause a painful, swollen perineum.