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Muscle

Splenius Cervicis
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Muscle

Rectus Abdominis
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Neck & trunk OIAN

Neck and trunk muscles OIAN

MuscleOrigin - OInsertion - IAction - ANerve - NGroup/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
Created by: srussel
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