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 walls and. coronary circulation. The heart is located in the central-left part of the thorax (lying on the di-. aphragm) and is oriented anteriorly, with the apex directed forward, down-. ward, and leftward. The myocardium and speciï¬c conduction system are per-.