Axial Musculature OIA Chart PDF

**Muscle name** **Origin** **Insertion** **Action** Sternocleidomastoid Sternum & Clavicle Mastoid Process **Unilateral:** Ipsi- Lat. Neck Flexion Contra- Neck Rotation **Bilateral:** Neck Flexion Scalenes Cervical Vertebrae Ribs 1-2 **Unilateral:** Ipsi- Lat. Neck Flexion **Bilatera...

**Muscle name** **Origin** **Insertion** **Action** Sternocleidomastoid Sternum & Clavicle Mastoid Process **Unilateral:** Ipsi- Lat. Neck Flexion Contra- Neck Rotation **Bilateral:** Neck Flexion Scalenes Cervical Vertebrae Ribs 1-2 **Unilateral:** Ipsi- Lat. Neck Flexion **Bilateral:** Neck Flexion \*Aid in respiration\* Splenius Capitis Lower C-Spine/ Upper T-Spine Occipital bone & Cervical vert. **Unilateral:** Ipsi- Lat. Neck "extension" **Bilateral:** Neck extension Upper Trapezius Spinous processes of Cervical spine Occipital bone Clavicle **Unilateral:** **Ipsi: Neck Extension** **Bilateral: Neck extension** External Oblique Lower Ribs Anterior iliac crest/ Pubic symphysis **Unilateral:** Contra- OPP. Side trunk rotation **Bilateral:** Stabilize viscera & Aid trunk flexion Internal Oblique Iliac crest Lower ribs/Costal cartilage & pubis **Unilateral:** Ipsi- SAME side trunk rotation **Bilateral:** Stabilize viscera & Aid trunk lateral flexion Transverse Abdominis Iliac crest/ Inguinal ligament Linea alba, pubis & Abd. Connective tissue **Bilateral**: Compress/stabilize visceral organs Rectus Abdominis Pubic symphysis Xiphoid process & Costal cartilage **Bilateral:** Forward trunk flexion. -Stabilize viscera & stabilize pelvic floor Erector Spinae Nuchal lig./ Ribs/ Sacrum/ Lumbar spine Mastoid process, Ribs, Cervical & Thoracic spine **Unilateral:** Ipsi- Lat. Trunk flexion **Bilateral:** Trunk extension & posture Quadratus Lumborum Iliac crust Rib 12 & Lumbar spine **Unilateral:** Ipsi- Lat. Trunk flexion **Bilateral:** Lumbar spine extension Axial Musculature