Which space houses the deep fascia and is composed of small fat lobules?

• A. Retromammary space
• B. Inframammary space
• C. Subcutaneous space
• D. Pectoral space

Answer: (A)

The space behind the breast tissue that lies between the gland and the chest wall is the retromammary space. Its posterior boundary is formed by the pectoral (deep) fascia, and it is filled with loose connective tissue and small fat lobules. This combination makes it a distinct fatty plane that allows the breast to move over the chest wall and provides a separable space for surgical implants or fluid if present. This description fits best with the retromammary space, unlike the other regions, which are located in different positions relative to the breast and contain different tissue patterns.