What does depression refer to in terms of bone movement?

Depression in the context of bone movement specifically refers to the downward movement of a body part, particularly in relation to the mandible (jaw) and the scapula (shoulder blade). This term is commonly used in anatomy to describe how certain bones can move vertically. For example, when the shoulders are relaxed and lowered, this is considered depression of the scapulae. Similarly, when the jaw is opened downward, it is an example of depression of the mandible. In functional anatomy, understanding this term helps clarify various movements and their directional qualities, which is essential for comprehending biomechanics and movement patterns in exercises and rehabilitation.