Boundaries
The thoracic inlet is essentially a hole surrounded by a bony ring, through which several vital structures pass.
The superior thoracic aperture is bounded by: the first thoracic vertebra (T1) posteriorly, the first pair of ribs laterally (more specifically, the first ribs form lateral C-shaped curves posterior to anterior), the costal cartilage of the first rib and the superior border of the manubrium anteriorly.
Read more about this topic: Superior Thoracic Aperture
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