click below
click below
Normal Size Small Size show me how
IOAN
Muscles of the anterior trunk
| muscle | origin | insertion | action | innervation |
|---|---|---|---|---|
| Rectus Abdominus | pubic crest | xiphoid process and costal cartilages of fifth to seventh rib | trunk flexion and compression of abdomen | seventh through 12th intercostal nerves |
| Transverse Abdominus | Inguinal ligament, iliac crest, thoracolumbar fascia, and last six ribs | Inguinal ligament, iliac crest, thoracolumbar fascia, and last six ribs. | Compression of abdomen | Seventh through 12thintercostal, iliohypogastric, and ilioinguinal nerves |
| internal oblique | inguinal ligament, iliac crest and thoracolumbar fascia | tenth through 12th ribs and linea alba | bilateral: trunk flexion and compression of abdomen unilateral: trunk lateral bending and rotation to same side | eighth through 12th intercostal iliohypogastric, and ilioinguinal nerves |
| External oblique | Iliac crest, pubic tubercle and linea alba | lower eight ribs laterally | bilateral: trunk flexion and compression of abdomen unilateral: trunk lateral bending and rotation to opposite side. | eighth through 12th intercostal, iliohypogastric and ilioinguinal nerves |