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Back Muscles OIAIA
Back Muscles Origin, Insertion, Action, Innervation, Artery
| Question | Answer |
|---|---|
| Erector spinae Origin | iliac crest, sacrum, transverse and spinous processes of vertebrae and supraspinal ligament |
| Erector spinae Insertion | angles of the ribs, transverse and spinous processes of vertebrae, posterior aspect of the skull |
| Erector spinae Action | extends and laterally bends the trunk, neck and head |
| Erector spinae Innervation | segmentally innervated by dorsal primary rami of spinal nerves C1-S5 |
| Erector spinae Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Iliocostalis Origin | iliac crest and sacrum |
| Iliocostalis Insertion | angles of the ribs |
| Iliocostalis Action | extends and laterally bends the trunk and neck |
| Iliocostalis Innervation | dorsal primary rami of spinal nerves C4-S5 |
| Iliocostalis Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Interspinales Origin | upper border of spinous process |
| Interspinales Insertion | lower border of spinous process above |
| Interspinales Action | extend trunk and neck |
| Interspinales Innervation | dorsal primary rami of spinal nerves C1-L5 |
| Interspinales Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Intertransversarii Origin | upper border of transverse process |
| Intertransversarii Insertion | lower border of transverse process above |
| Intertransversarii Action | laterally bend trunk and neck |
| Intertransversarii Innervation | dorsal primary rami of spinal nerves C1-L5 |
| Intertransversarii Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Longissimus Origin | transverse process at inferior vertebral levels |
| Longissimus Insertion | transverse process at superior vertebral levels and mastoid process |
| Longissimus Action | extends and laterally bends the trunk, neck and head |
| Longissimus Innervation | dorsal primary rami of spinal nerves C1-S1 |
| Longissimus Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Multifidus Origin | sacrum, transverse processes of C3-L5 |
| Multifidus Insertion | spinous processes 2-4 vertebral levels superior to their origin |
| Multifidus Action | extend and laterally bend trunk and neck, rotate to opposite side |
| Multifidus Innervation | dorsal primary rami of spinal nerves C1-L5 |
| Multifidus Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Muscles of the Tranversospinal Group | semispinalis, multifidus and rotators |
| Obliquus capitis inferior Origin | spinous process of the axis |
| Obliquus capitis inferior Insertion | transverse process of atlas |
| Obliquus capitis inferior Action | rotates the head to the same side |
| Obliquus capitis inferior Innervation | suboccipital nerve (DPR of C1) |
| Obliquus capitis inferior Artery | occipital a. |
| Obliquus capitis superior Origin | transverse process of atlas |
| Obliquus capitis superior Insertion | occipital bone above inferior nuchal line |
| Obliquus capitis superiorAction | extends the head, rotates the head to the same side |
| Obliquus capitis superior Innervation | suboccipital nerve (DPR of C1) |
| Obliquus capitis superior Artery | occipital a |
| Suboccipital Triangle is formed by? | the suboccipital triangle is formed by obliquus capitis superior and inferior and rectus capitis posterior major |
| Rectus capitis posterior major Origin | spinous process of axis |
| Rectus capitis posterior major Insertion | inferior nuchal line |
| Rectus capitis posterior major Action | extends the head, rotate to same side |
| Rectus capitis posterior major Innervation | suboccipital nerve (DPR of C1) |
| Rectus capitis posterior major Artery | occipital a |
| Rectus capitis posterior minor Origin | posterior tubercle of atlas |
| Rectus capitis posterior minor Insertion | inferior nuchal line medially |
| Rectus capitis posterior minor Action | extends the head |
| Rectus capitis posterior minor Innervation | suboccipital nerve (DPR of C1) |
| Rectus capitis posterior minor Artery | occipital a. |
| What is the location relationship between the Rectus capitis muscles? | rectus capitis posterior minor is deeper and inserts more medial than rectus capitis posterior major |
| Rotatores Origin | transverse processes |
| Rotatores Insertion | long rotatores: spines 2 vertebrae above origin; short rotatores: spines 1 vertebrae above origin |
| Rotatores Action | rotates the vertebral column to the opposite side |
| Rotatores Innervation | dorsal primary rami of spinal nerves C1-L5 |
| Rotatores Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Semispinalis Origin | transverse processes of C7-T12 |
| Semispinalis Insertion | capitis: back of skull between nuchal lines; cervicis & thoracis: spines 4-6 vertebrae above origin |
| Semispinalis Action | extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side |
| Semispinalis Innervation | dorsal primary rami of spinal nerves C1-T12 |
| Semispinalis Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Serratus posterior inferior Origin | thoracolumbar fascia, spines of vertebrae T11-T12 and L1-L2 |
| Serratus posterior inferior Insertion | ribs 9-12, lateral to the angles |
| Serratus posterior inferior Action | pulls down lower ribs |
| Serratus posterior inferior Innervation | branches of the ventral primary rami of spinal nerves T9-T12 |
| Serratus posterior inferior Artery | lowest posterior intercostal a., subcostal a., first two lumbar aa. |
| Serratus posterior superior Origin | ligamentum nuchae, spines of vertebrae C7 and T1-T3 |
| Serratus posterior superior Insertion | ribs 1-4, lateral to the angles |
| Serratus posterior superior Action | elevates the upper ribs |
| Serratus posterior superior Innervation | branches of the ventral primary rami of spinal nerves T1-T4 |
| Serratus posterior superior Artery | posterior intercostal aa. 1-4 |
| Spinalis Origin | spinous processes at inferior vertebral levels |
| Spinalis Insertion | spinous processes at superior vertebral levels and base of the skull |
| Spinalis Action | extends and laterally bends trunk and neck |
| Spinalis Innervation | dorsal primary rami of spinal nerves C2-L3 |
| Spinalis Artery | supplied segmentally by: deep cervical a., posterior intercostal aa., subcostal aa., lumbar aa. |
| Splenius capitis Origin | ligamentum nuchae and spines of C7-T6 vertebrae |
| Splenius capitis Insertion | mastoid process and lateral end of the superior nuchal line |
| Splenius capitis Action | extends and laterally bends the neck and head, rotates head to the same side |
| Splenius capitis Innervation | dorsal primary rami of spinal nerves C2-C6 |
| Splenius capitis Artery | supplied segmentally by: deep cervical a., posterior intercostal aa. |
| Splenius cervicis Origin | ligamentum nuchae and spines of C7-T6 vertebrae |
| Splenius cervicis Insertion | posterior tubercles of the transverse processes of C1-C3 vertebrae |
| Splenius cervicis Action | extends and laterally bends neck and head, rotates head to the same side |
| Splenius cervicis Innervation | dorsal primary rami of spinal nerves C2-C6 |
| Splenius cervicis Artery | supplied segmentally by: deep cervical a., posterior intercostal aa. |