Diaphragm Anatomy: Muscles, Function, and Nerve Control

The diaphragm is a dome-shaped muscle separating the thoracic and abdominal cavities. Its contraction flattens the dome, expanding the chest cavity for inhalation; relaxation allows exhalation.

The phrenic nerve (C3–C5) controls diaphragmatic movement. The possessive form for its muscles is "your diaphragmatic muscles."