Superior aperture of thorax:
1. Bounded by
a. 1st thoracic vertebrae
b. first pair of ribs and costal cartilages
c. manubrium of sternum
2. Aperture allows passage of large vessels, nerves, trachea, and esophagus
3. On an oblique plane so that anterior boundary is 2 vertebral levels lower than the posterior boundary
Tap on the superior aperture in the image below and it will appear shaded red.