📖 Static demo — read-only snapshot

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External Oblique

Superficial lateral abdominal muscle. Fibers run inferomedially. Contralateral rotation and lateral flexion.

Draft95%

Anatomy

Origin: External surfaces of ribs 5-12
Insertion: Linea alba, pubic tubercle, anterior half of iliac crest
Action: Contralateral trunk rotation, ipsilateral lateral flexion, trunk flexion, core stabilization
Innervation: Thoracolumbar nerves (T5-T12)
Blood Supply: Lower posterior intercostal arteries, subcostal artery, deep circumflex iliac artery

Movements (8)

Movement	Joint	Role	Notes
Thoracic Rotation	Thoracic Intervertebral Joints	Primary	Contralateral rotation
Lumbar Flexion	Lumbar Intervertebral Joints	Primary	~1/3 of total flexor moment
Lumbar Lateral Flexion	Lumbar Intervertebral Joints	Primary	Ipsilateral; force direction ±32° from sagittal
Lumbar Rotation	Lumbar Intervertebral Joints	Primary	Contralateral rotation; large obliques dominate over small spinal rotators
Thoracic Lateral Flexion	Thoracic Intervertebral Joints	Primary	Ipsilateral
Thoracic Flexion	Thoracic Intervertebral Joints	Secondary	—
Posterior Pelvic Tilt	Lumbopelvic	Secondary	Prime-mover mapping (data-integrity pass).
Lateral Pelvic Tilt	Lumbopelvic	Secondary	Prime-mover mapping (data-integrity pass).

Exercises (50)

Exercise	Role
Front Plank and Variations	Primary
Side Plank (Lateral Bridge)	Primary
World's Greatest Stretch	Primary
Russian Twist	Primary
Side-Bridge	Primary
Walking Lunges with Trunk Rotation	Primary
Pallof Press (Anti-Rotation)	Primary
Seated Trunk Rotation	Primary
Open Book Stretch (Thoracic Rotation)	Primary
Modified Curl-Up / Dead Bug	Primary
Thoracic Extension/Rotation Mobilization	Secondary
McGill Curl-Up	Secondary
Overhead Squat (Assessment & Training)	Secondary
Turkish Get-Up	Secondary
Side Plank with Hip Abduction	Secondary
Sit-Up	Secondary
Crunch	Secondary
Mountain Climber	Secondary
Hanging Leg Raise	Secondary
Hollow Body Hold	Secondary
Bird Dog to Elbow-Knee	Secondary
Hip Thrust	Stabilizer
Bird Dog Exercise	Stabilizer
Standing Hip Circles	Stabilizer
Back Squat (Barbell)	Stabilizer
Front Squat	Stabilizer
Goblet Squat	Stabilizer
Pull-Up	Stabilizer
Chin-Up	Stabilizer
Dumbbell Shoulder Press	Stabilizer
Copenhagen Adduction	Stabilizer
Standing Hip Hike	Stabilizer
Burpee	Stabilizer
Jumping Jack	Stabilizer
Bear Crawl	Stabilizer
Push-Up	Stabilizer
Cat-Cow	Stabilizer
Backpack Weighted Carry	Stabilizer
Archer Push-Up	Stabilizer
Tuck L-Sit	Stabilizer
Cook Hip Lift (Single-Leg Bridge with Contralateral Hip Flexion)	Stabilizer
Glute Bridge with March	Stabilizer
Pelvic Clock Mobilization	Synergist
Thoracic Rotation in Quadruped (Thread the Needle)	Synergist
Diaphragmatic / Rib Expansion Breathing Exercises	Synergist
Active Anterior Pelvic Tilt	lengthening
Standing Lumbar Extension	lengthening
Prone Press-Up (McKenzie)	lengthening
Cobra Pose	lengthening
Standing IT Band / Lateral Chain Stretch	lengthening

Sources

Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Anatomy of External Oblique — origin, insertion, action, innervation
Muscles: Testing and Function with Posture and Pain — Manual muscle testing for External Oblique