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11 muscles of back dr swati
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11 muscles of back dr swati

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  • 1. Muscles of back• Introduction• Cutaneous nerve supply• Development of muscles• Muscles of back Introduction Classification• Nerve supply of muscles of back• Action of muscles of back
  • 2. Cutaneous Nerves• Dorsal primary rami of spinal nerves.• Each dorsal primary ramus divides into medial and lateral branches.
  • 3. Muscles of back Development:• Epaxial muscles: Extensors of the neck and vertebral column• Hypaxial muscles: Thoracic myotome form lateral and ventral flexor muscles of the vertabral column,lumbar myotome form quadratus lumborum.
  • 4. Arrangement of Back Muscles• Three groups: Superficial: Extrinsic. Intermediate: Extrinsic. Deep: Intrinsic.
  • 5. Ligamentum nuchae•Consist of dorsalraphae and medialfascial septum•Attachment•extension
  • 6. Thoracolumbar Fascia• Deep fascia on the back of trunk.• It binds long exetonsors of vertabral column to posterolateral surfaces of vertabral bodies.• Two parts :Lumbar Thoracic
  • 7. Thoracolumbar Fascia Laminae• Posterior lamina to lumbar spinous processes.• Middle lamina to lumbar transverse processes.• Anterior lamina (deepest) to lumbar transverse processes.
  • 8. Superficial Extrinsic Muscles• Connect limb to axial skeleton.• Innervated by ventral rami or CN XI.• Include: Trapezius. Latissimus dorsi. Levator scapulae. Rhomboideus major. Rhomboideus minor.
  • 9. Trapezius:• Diamond shaped• Origin:• Insertion:• Innervation:• Action:
  • 10. Lattissimus dorsi:• Origin:• Insertion:• Innervation:• Action:
  • 11. Levator scapulae:• Origin :• Insertion:• Innervation :• Action:
  • 12. Rhomboid major:• Origin:• Insertion:Rhomboid minor:• Origin:• Insertion:• Innervation:• Action:
  • 13. Intermediate Extrinsic Muscles• Serratus posterior group: Serratus posterior superior. Serratus posterior inferior• Innervated by ventral rami of spinal nerves.
  • 14. Intrinsic Back Muscles• True intrinsic muscles of the back are innervated by dorsal (posterior) rami.• Three groups: Superficial Intermediate Deep.
  • 15. INTRINSIC (DEEP) BACK MUSCLES• Superficial :Splenius , Erector spinae• Deeper layer : Spinotransverse group, Suboccipitals• Deepest layer: Interspinous, Intertranseverse .
  • 16. Superficial muscles• Consists of the Splenius group:• Long muscles.• Originate from ligamentum nuchae and spinous processes.• Cover neck and upper part of thorax.• Two parts: Splenius capitis Splenius cervicis
  • 17. Splenius capitis:• Attachments:• Relations:• Innervation:• Action:Splenius cervicis:• Attachments:• Relations:• Innervation:• Action:
  • 18. Superficial IntrinsicErector spinae: Three muscles each with three regional parts.1.Spinalis:Spinalis thoracis Spinalis cervicis Spinalis capitis2.Longissimus:Longi capitis Longi cervicis Longi thoracis3.Iliocostalis:Iliocost cervicis Iliocost thoracis Iliocost capitis
  • 19. Spinalis: Components: Thoracis: Attachments: Cervicis: Attachments: poorely developed Capitis: Attachments:
  • 20. Intermediate Intrinsic• Longissimus:Central component of erector spinae Longissimus capitis: Attachments Longissimus cervicis: Attachments: Longissimus thoracis:Largest component Has lumbar and thoracic part. Attachments: .
  • 21. • Iliocostalis:most lateral component of erector spinae Components: Iliocostalis cervicis: Attachments Iliocostalis thoracis: Attachment Iliocostalis lumborum: Attachments Has lumbar and thoracic part
  • 22. Erector spinae aponeurosis:• Formation:• Attachments:• Relations:• Innervation:• Action:
  • 23. Deep Intrinsic Muscles• Spinotransverse group: Present between spinous process and transverse elements of vertebrae. Components: Rotators: Rotators thoracis Rotators cervicis Rotators capitis Multifidus Semispinalis: Semi cervicis Semi thoracis Semi capitis Suboccipital muscle
  • 24. Rotatores• Deepest and shortest muscle• 11 pairs of small quadrilateral muscle• Attachments:• Components: Rotator brevis: Attachments Rotator longus: Attachments
  • 25. Multifidus• Thick muscle mass.• Present at cervical,thoracic,upper lumbar levels lies lateral to spinous process and also expands to cover posterior surface of sacrum.• Multifidus arises from lateral surface and tip of trnsverse process and insert into transverse elements of vertebrae.
  • 26. Semispinalis• Longest fibres ofspinotransverse group• Components: Cervicis: Attachments Thoracis: Attachments Capitis: Attachments• Relations:• Innervation:• Action:
  • 27. Suboccipital muscle:• 4 small muscles that connect occipital bone,atlas and axis.• Suboccipital triangle• Components: Rectus capitis posterior major: Attachments Rectus capitis posterior minor: Attachments Obliquus capitis inferior: Obliquus capitis superior:• Innervation:• Actions:
  • 28. Intrinsic Segmental Muscles• Interspinales: Attachments.• Intertransversarii Attachments.
  • 29. Applied:
  • 30. • Low bachache: Lumbar strain Lumbar radiculopathy• Lumbar triangle: – Superior(Grynfeltt) – Inferior(Petit) • Renal angle

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