Name

# Internal Obliques

Pronunciation

(o-BLEEK)

Origin/Proximal Attachment

Middle lip of the iliac crest; Linea alba; lower borders of the lateral 1/3 of the inguinal ligament; thoracolumbar fascia

Insertion/Distal Attachment

Unilateral: lower 3 or 4 ribs

Action/Relevance

Intercostal nerves (7th-12th) Rotates trunk to same side of contractionLaterally flexes trunk to same side of contraction Bilateral: Flexes the trunk4. Compresses the abdomen

Innervation

Iliohypogastric nerves (T12, L1) Ilioinguinal nerves (T12, L1)

Notes

The Obliques and the Transversus Abdominisincrease the intra-abdominal pressure necessary for the support of the vertebral column in some exercises.