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thoracic inlet
The thoracic inlet or superior thoracic aperture refers to the opening at the top of the thoracic cavity. It is also referred to clinically as the thoracic outlet as in thoracic outlet syndrome, which refers to the superior thoracic aperture, and not to the lower larger opening the inferior thoracic aperture called the thoracic outlet.
==Structure==
The thoracic inlet is essentially a hole surrounded by a bony ring, through which several vital structures pass.
The thoracic inlet 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''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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