Menactra Vaccine Immunogenicity. Helps protect against 4 vaccineâpreventable serogroups1,2. Immunogenicity proven in clinical trials â confirmed in everyday use1. The immune responses to Menactra and Menomune-A/C/Y/W-135 vaccines were comparable for all 4 serogroups1,6.
The mediastinum is the middle section of the chest cavity. The chest cavity contains the left and right lungs, which lie on either side of the heart. The heart is contained in the portion of the chest known as the mediastinum.
The heart is located in the thoracic cavity. This places the heart between the lungs, behind the sternum, in front of the thoracic vertabrae, and above the diaphragm. The heart's apex (conical tip) lies on the diaphragm and points to the left of the body. It is at the apex where the heartbeat is most easily felt and heard through the stethoscope.