GROSS ANATOMY

Detailed explanation-1: -The serratus posterior superior helps to elevate the upper ribs during inhalation. The serratus posterior inferior, inversely, helps to draw the lower ribs downward and backward during exhalation.

Detailed explanation-2: -The main function of these muscles is to facilitate the act of respiration; the serratus posterior superior muscle elevates the ribs, while the serratus posterior inferior muscle depresses the ribs. These actions are particularly important in forced respiration.

Detailed explanation-3: -Serratus posterior superior: elevate the ribs during inspiration(accessory muscle of inspiration) and has a stabilization role for thorax. Bilateral action of posterior superior/posterior inferior reduce extension of thoracic vertebrae.

Detailed explanation-4: -The serratus posterior inferior is located in the lower back at the junction of the thoracic and lumbar regions. It is larger than the superiorly located serratus posterior superior. Serratus posterior muscles form the intermediate layer of the back muscles, and a wide interval separates both.

Detailed explanation-5: -When the shoulder girdle is fixed, all three parts of the serratus anterior muscle work together to lift the ribs, assisting with respiration. The serratus anterior, also known as the “boxer’s muscle, ” is largely responsible for the protraction of the scapula, a movement that occurs when throwing a punch.