The term "space of Langer" is not commonly used in anatomical or medical literature. However, based on the context, it seems to be referring to the foramen of Langer, which is a defect in the deep pectoralis fascia. More specifically, it's the area through which the axillary tail of Spence (an extension of breast tissue into the armpit) extends. This defect is located at the level of the third intercostal space.
In summary, while not a "space" in the traditional sense, the foramen of Langer acts as a passageway for the breast tissue to extend into the axilla.
