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10 terms

Muscles involved in respiration

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Diaphragm
Dome-shaped sheet of muscle and connective tissue that separates the thorax from the abdominal cavity
Muscle that is associated with quiet breathing
Muscle that moves inferiorly during inspiration
Muscle that moves superiorly during expiration
External Intercostals
Occupies superficial intercoastal space
Origin: inferior margin of superior rib
Insertion: superior margin of inferior rib
Elevates ribs during inspiration
External Oblique
Compresess the abdominal wall during expiration
Internal Intercostals
Occupies deep intercostal space
Origin: superior margin of inferior rib
Insertion: superior margin of inferior rib
Muscle that depresses the ribs in expiration
Internal Oblique
Middle of three muscles that form the anterolateral abdominal wall
Compresses the abdominal wall during expiration
Pectoralis Major
Muscle that is deep to the pectoralis major on the upper ribs
Origin: Coracoid process of scapula
Insertion: 3,4,5th ribs
Elevates ribs during inspiratio
Rectus Abdominus
Most external of the three muscles that form the anterolateral abdominal wall
Extends from xiphoid process to the symphysis pubis
Compresses abdominal wall during expiration
Serratus Anterior
Covers superior and lateral surface of the rib cage
Origin: superior 8 or 9 ribs
Insertion: vertebral border and inferior angle of scapula
Elevates ribs during inspiration
Sternocleidomastodeus
Crosses the neck from the sternum to the mastoid process
Origin: mastoid process of temporal bone
Insertion: Clavicle and sternum
Elevates sternum during inspiration
Transverse Abdominus
Deepest of three muscles that form the anterolateral abdominal wall
Compresses the abdominal wall during expiration