25/03/2026
Learning corner!!
The chest cavity is formed by 12 pairs of ribs on each side and the sternum, which wraps around to connect with the spine. The primary muscles involved in respiration are the intercostal muscles, located between the ribs, and the diaphragm. The intercostal muscles assist in expanding and contracting the chest cavity. When the diaphragm contracts, it creates negative pressure within the chest, drawing air into the lungs. The phrenic nerve, consisting of a left and a right nerve, provides the necessary signals for the diaphragm to contract and relax.