Name
Pronunciation
(o-BLEEK)
Origin/Proximal Attachment
Lower borders of the lower 7 ribs (runs like hands in your pocket)
Insertion/Distal Attachment
Outer lip of the iliac crest; inguinal ligament; anterior layer of the rectus sheath
Action/Relevance
Unilateral: Rotates trunk to side opposite of contractionLaterally flexes trunk to same side of contraction Bilateral: Flexes the trunk4. Compresses the abdomen
Innervation
Intercostal nerves (7th-12th) Iliohypogastric nerves (T12, L1) Ilioinguinal nerves (T12, L1)
Notes
The Obliques and the Transversus Abdominis increase the intra-abdominal pressure necessary for the support of the vertebral column in some exercises.