The superior thoracic aperture opens directly into the root of the neck.

The superior aspect of each pleural cavity extends approximately 2-3 cm above rib I and the costal cartilage into the neck. Between these pleural extensions, major visceral structures pass between the neck and superior mediastinum. In the midline, the trachea lies immediately anterior to the esophagus. Major blood vessels and nerves pass in and out of the thorax at the superior thoracic aperture anteriorly and laterally to these structures.

Webster Dictionary Meaning

1. Neck
- The part of an animal which connects the head and the trunk, and which, in man and many other animals, is more slender than the trunk.
- Any part of an inanimate object corresponding to or resembling the neck of an animal
- The long slender part of a vessel, as a retort, or of a fruit, as a gourd.
- A long narrow tract of land projecting from the main body, or a narrow tract connecting two larger tracts.
- That part of a violin, guitar, or similar instrument, which extends from the head to the body, and on which is the finger board or fret board.
- A reduction in size near the end of an object, formed by a groove around it; as, a neck forming the journal of a shaft.
- the point where the base of the stem of a plant arises from the root.
2. Neck
- To reduce the diameter of (an object) near its end, by making a groove around it; -- used with down; as, to neck down a shaft.
3. Neck
- To kiss and caress amorously.
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