The Tail of Spence is named after him.

The Tail of Spence (Spence's tail, axillary process, axillary tail) is an extension of the tissue of the breast that extends into the axilla.

Asymmetric breast forms incorporate an extension towards the armpit to replicate the shape of the tail of Spence, while symmetric "triangle" or "teardrop" prostheses do not incorporate that extension.

The Tail of Spence (Spence's tail, axillary process, axillary tail) is an extension of the tissue of the breast that extends into the axilla.

The Tail of Spence (Spence's tail, axillary process, axillary tail) is an extension of the tissue of the breast that extends into the axilla.

The palpation process covers the entire breast, including the "axillary tail" of each breast that extends toward the axilla (armpit).

The Tail of Spence (Spence's tail, axillary process, axillary tail) is an extension of the tissue of the breast that extends into the axilla.