Rectus abdominis symphysis and crest of pubis Xiphoid process and cartilages of Flexion of vertebral column; stabilizes Intercostal 7 to ribs 5 to 7 pelvis during walking; compresses 12 abdomen to aid in defecation, urination, forced exhalation. External abdominal External surface of lower 8 ribs Linea alba; pubic crest; pubic Rotation and lateral flexion of trunk; Intercostals 8 to oblique tubercle; iliac crest increases intraabdominal pressure 12, during forced expiration iliohypogastric, ilioinguinal Internal abdominal Lateral half of inguinal ligament, Lower four ribs, linea alba and by Compresses abdomen, and flex Intercostals 8 to oblique anterior iliac crest and thoracolumbar conjoined tendon to pubis vertebral column; acting singly, 12, fascia laterally flex vertebral column iliohypogastric, ilioinguinal Transverse abdominis Lateral third of inguinal ligament, Linea alba, pubis crest Compresses abdomen and Increases Intercostals 7 to anterior iliac crest, and thoracolumbar intraabdominal pressure during forced 12, fascia expiration iliohypogastric, ilioinguinal MUSCLES OF THE ORIGIN INSERTION ACTION NERVE SHOULDER AND ARM Deltoid lateral third of clavicle, acromion Deltoid tuberosity of humerus Anterior fibers: medial rotation and Axillary process and spine of scapula flexion of arm Middle fibers: abduction of arm Posterior fibers: lateral rotation and extension of arm
Rectus abdominis symphysis and crest of pubis Xiphoid process and cartilages of ribs 5 to 7 Flexion of vertebral column; stabilizes pelvis during walking; compresses abdomen to aid in defecation, urination, forced exhalation. Intercostal 7 to 12 External abdominal oblique External surface of lower 8 ribs Linea alba; pubic crest; pubic tubercle; iliac crest Rotation and lateral flexion of trunk; increases intraabdominal pressure during forced expiration Intercostals 8 to 12, iliohypogastric, ilioinguinal Internal abdominal oblique Lateral half of inguinal ligament, anterior iliac crest and thoracolumbar fascia Lower four ribs, linea alba and by conjoined tendon to pubis Compresses abdomen, and flex vertebral column; acting singly, laterally flex vertebral column Intercostals 8 to 12, iliohypogastric, ilioinguinal Transverse abdominis Lateral third of inguinal ligament, anterior iliac crest, and thoracolumbar fascia Linea alba, pubis crest Compresses abdomen and Increases intraabdominal pressure during forced expiration Intercostals 7 to 12, iliohypogastric, ilioinguinal MUSCLES OF THE SHOULDER AND ARM ORIGIN INSERTION ACTION NERVE Deltoid lateral third of clavicle, acromion process and spine of scapula Deltoid tuberosity of humerus Anterior fibers: medial rotation and flexion of arm Middle fibers: abduction of arm Posterior fibers: lateral rotation and extension of arm Axillary
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