在背部，第3胸椎棘突下凹陷中，后正中线上。

注：当后正中线与两肩胛冈内端连线的交点处，第3胸椎棘突下凹陷中。

In the upper back region, in the depression inferior to the spinous process of the third thoracic vertebra (T3), on the posterior median line.

Note: The depression inferior to the spinous process of the third thoracic vertebra (T3) which is at the intersection of two imaginary lines: the posterior median line and the horizontal line of the medial end of the spine of the scapula.

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