The tail of Spence (Spence's tail, axillary process, axillary tail) has historically been described as an extension of the tissue of the upper outer quadrant of the breast traveling into the axilla. The "axillary tail" has been reported to pass into the axilla through an opening in the deep fascia called foramen of Langer. The "tail of Spence" was named after the Scottish surgeon James Spence, who served as a President of the Royal College of Surgeons in Edinburgh in the latter half of the 19th Century.
