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Neck & trunk OIAN
Neck and trunk muscles OIAN
| Muscle | Origin - O | Insertion - I | Action - A | Nerve - N | Group/Location |
|---|---|---|---|---|---|
| Splenius Cervicis | Spinous processes of T3-T6 | Transverse processes of C1-C3 | Bilateral: extend head / Unilateral: rotate & laterally bend neck to same side | Middle & lower cervical nerves | Posterior |
| Rectus Abdominis | Pubis | Xiphoid process & costal cartilages of 5th, 6th & 7th ribs | Trunk flexion; compression of abdomen | 7th-12th intercostal nerves | Anterior |
| External Oblique | Lower 8 ribs laterally | Iliac crest & linea alba | bilateral: trunk flexion; compression of abdomen / Unilateral: trunk lateral bending; rotation to opposite side | 8th-12th intercostal, iliohypogastric & ilioinguinal nerves | Anterior |
| Interanl Oblique | Inguinal ligament, iliac crest, thoracolumbar fascia | 10th, 11th & 12th ribs; abdominal aponeurosis | Bilateral: trunk flexion; compression of abdomen / Unilateral: trunk lateral bending; rotation to same side | 8th-12th intercostal, iliohypogastic & ilioinguinal nerves | Anterior |
| Transverse Abdominis | Inguinal ligament, iliac crest, thoracolumbar fascia & last 6 ribs | Abdominal aponeurosis & linea alba | Compression of abdomen | 7th-12th intercostal, iliohypogastric & ilioinguinal nerves | Anterior |
| Erector spinae (3) | Spinous processes, transverse processes & posterior ribs from the occiput to the sacrum & ilium | Spinous processes, transverse processes & posterior ribs from the occiput to the sacrum & ilium | Bilateral: extend / Unilateral: lateral bend | Spinal Nerves | Posterior, run parallel to vertebral column |
| Transversospinalis (3) | Transverse processes | Spinous processes of vertebrae above | Bilateral: extend trunk / Unilateral: rotate trunk to opposite side | Spinal Nerves | Posterior |
| Interspinales | Spinous process below | Spinous process above | Trunk extension | Spinal Nerves | Posterior |
| Intertransversarii | Transverse process below | Transverse process above | Trunk extension & lateral bending | Spinal Nerves | Posterior |
| Quadratus lumborum | Iliac crest | 12th rib, transverse processes of all lumbar vertebrae | Trunk lateral bending | 12th thoracic & 1st lumbar nerves | Lateral |
| Iliocostalis (ES) | Posterior ribs from the occiput to the sacrum & ilium | Posterior ribs from the occiput to the sacrum & ilium | Extension & lateral bending | Spinal Nerves | Posterior, most lateral part of ES |
| Longissimus (ES) | Attach to the transverse processes from the occiput to the sacrum | Attach to the transverse processes from the occiput to the sacrum | Trunk extension & lateral bending | Spinal Nerves | Posterior, intermediate part of ES |
| Spinalis (ES) | Spinous processes of cervical & thoracic vertebrae & nuchal ligament | Spinous processes of cervical & thoracic vertebrae & nuchal ligament | Trunk Extension | Spinal Nerves | Posterior, most medial part of ES |
| Anterior Scalene | Transverse processes of C3-C6 | Superior surface of the 1st rib | Neck lateral bending; assist in neck flexion | Lower cervical nerve | Deep to SCM |
| Middle Scalene | Transverse processes of C2-C7 | Superior surface of the 1st rib | Neck lateral bending; assist in neck flexion | Lower cervical nerve | Deep to SCM |
| Posterior Scalene | Transverse processes of C5-C7 | 2nd rib | Neck lateral bending; assist in neck flexion | Lower cervical nerve | Deep to SCM; smallest & deepest |
| Sternocleidomastoid (SCM) | Sternum & clavicle | Mastoid Process | Bilateral: flexes neck, hyperextends head / Unilateral: laterally bends the neck to the same side; rotates head to the opposite side | Accessory Nerve (crainal nerve XI); 2nd & 3rd cervical nerves | Anterior |
| Scalene (3) | Transverse processes of the cervical vertebrae | First & second ribs | Bilateral: assists in neck flexion / Unilateral: neck lateral bending | Lower cervical nerve | Anterior |
| Splenius Capitis | Lower half of nuchal ligament; spinous processes of C7-T3 | Lateral occipital bone; mastoid process | Bilateral: extend head & neck / Unilateral rotate & laterally bend head to same side | Middle & lower cervical nerves | Posterior |