👉 The term "subiculum" is a term used in the medical field to describe a specific part of the human body. It is located at the base of the tailbone, and it's called this because it is connected to the sacrum (the upper part of the spine) and the coccyx (the lower part of the back). The subiculum is also sometimes referred to as the "lower lumbar spine" or the "lower coccygeal region".