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Musculoskeletal Anat

Respiration and Trunk muscles, origins, insertions, and actions

MuscleOriginInsertionAction
Internal intercostal Inferior rib Superior rib Rib cage depression during exhalation
Pectoralis major Upper ribs Coracoid process of scapula Elevates ribcage
Rectus abdominis Pubis Xiphoid process Ribs Trunk flexion @ intervertebral joints
External oblique Lower ribs Linea alba Iliac crest Pubis Compress abdomen Trunk flexion Rotation @ intervertebral joints
Internal oblique Anterior iliac crest (thoracolumbar fascia) Linea alba Lower ribs Compress abdomen Trunk flexion Rotation @ intervertebral joints
Transversus abdominis Lower ribs Iliac crest (thoracolumbar fascia) Linea alba Compress abdominal cavity
Erector spinae 3 parallel groups of muscles that run length of trunk Lower vertebrae spinous processes Middle vertebrae trasverse processes Iliac crest Lower ribs Upper vertebrae spinous and transverse processes Upper ribs Trunk Neck (vertebral column) Extension Lateral flexion @ intervertebral joints
Diaphragm Inferior rib cage Lumbar vertebrae Central tendon in thorax/abdomen Moves inferiorly during inspiration to increase rib cage volume
External intercostal Superior rib Inferior rib Rib cage elevation during inhalation
Created by: meganntaylor