The lymphatic system keeps our tissues from retaining fluid and houses many of the key components of the immune system, like lymph nodes. Learn how this underappreciated body system is organized and how it functions.

This video shows the constant battle between the two main cell types in bone, osteoblasts and osteoclasts. Osteoblasts builds bone while osteoclasts dissolve bone for renovation and remodeling. The video explains how these cells influence the strength of bone throughout life.

This animated video shows techniques for breast self-examination and describes some of the abnormalities the may occur during the exam. While this video provides an overview of breast self-examination, ask your doctor to show the proper technique before you adopt the practice at home.

A modified radical mastectomy is a major surgery used to treat breast cancer. This animation shows which anatomical structures are removed during a modified radical mastectomy and how the procedure is different from other forms of mastectomy (breast removal surgery).