Main inspiratory muscle is ?
Respiratory muscles Inspiratory muscles1. During quiet breathing : Diaphragm (most impoant), external intercostal and interchondral pa of internal intercostal.2. During forced inspiration : Sternocleidomastoid, serratus anterior, serratus posterior superior, pectoralis major and minor, erector spinae, scaleni and levator costarum.Expiratory muscles1. During quiet breathing : Passive process due to passive recoil of the lungs and thoracic wall.2. During forced expiration : Internal intercostal, innermost intercostal, transversus thoracic, serratus posterior inferior, subcostalis, lattissimus dorsi and abdominal muscles (rectus abdominis, internal and external oblique and transversus abdominis).
Lattissimus dorsi
Transversus thoracis
Serratus anterior
Diaphragm