The axillary tail, also known as Tail of Spence, extends into which region of the breast?

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The Tail of Spence is the portion of breast tissue that grows toward the armpit. It extends into the upper outer quadrant, which is the region closest to the axilla. This lateral, superior extension toward the armpit places it in the upper outer part of the breast, making that quadrant the correct location. The central region sits around the nipple, the inner lower quadrant is toward the midline and bottom, and the inferior outer quadrant is the bottom outer area, whereas the axillary tail specifically tracks toward the armpit into the upper outer quadrant.