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Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida

Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida. Axial Musculature. Superficial Layer Erector Spinae Origin = sacrum/iliac crest Iliocostalis Insertion = ribs. Superficial Layer Erector Spinae Origin = sacrum/iliac crest Longissimus

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Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida

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  1. Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida Axial Musculature

  2. Superficial Layer Erector Spinae Origin = sacrum/iliac crest Iliocostalis Insertion = ribs

  3. Superficial Layer Erector Spinae Origin = sacrum/iliac crest Longissimus Insertion = transverse processes

  4. Superficial Layer Erector Spinae Origin = sacrum/iliac crest Spinalis Insertion = spinous processes

  5. Intermediate Layer Multifidus Origin = sacrum/iliac crest Insertion = spinous processes

  6. Intermediate Layer Semispinalis Origin = transverse processes Insertion =spinous processes

  7. Deep Layer Short slips of muscle, connecting adjacent vertebrae

  8. Three Divisions Body Wall Limbs Prevertebral

  9. Subdivision of Body Wall Group Abdominal Thoracic Perineal Neck

  10. Subdivision of the Abdominal Group Superficial = external Oblique Origin: Lower 8 ribs Insertion: top of rectus sheath

  11. Subdivision of the Abdominal Group Intermediate = Internal Oblique Origin: Iliac crest Insertion: Rectus sheath

  12. Subdivision of the Abdominal Group Deep = Transversus Origin: Thoracolumbar fascia Insertion: Sheath below abdominus rectus

  13. Subdivision of the Thoracic Group External intercostal Internal Intercostal Transversus thoracis

  14. Subdivision of the Perineal Group • Superficial = • Urogenital/anal • external anal • sphinceter

  15. Subdivision of the Perineal Group Intermediate = Pelvic Diaphragm: - Coccygeus - Levator ani

  16. Subdivision of the Perineal Group Deep = Transversalis Fascia

  17. Subdivision of the Neck Region Diaphragm ripped out early in development Scalenes are what are left.

  18. Strap muscles Rectus Abdominus

  19. Strap muscles Rectus Series Geniohyoid

  20. Strap muscles Rectus Series Omohyoid

  21. Strap muscles Rectus Series Sternohyoid Sternothyroid

  22. Strap muscles Pyramidalis

  23. Appendicular Musculature

  24. Innervation: Dorsal Ramus Hypaxial Distal Dorsal Branch Epaxial Distal Ventral Branch Ventral Ramus

  25. Each limb receives more than 1 nerve: Usually about 6

  26. Posterior branches extend more distally

  27. Limb Quadrants

  28. Dorsal Mass elevates (extends) limb Ventral Mass depresses (flexes) limb

  29. Caudal (Inferior) Dorsal (Posterior) Cranial (Superior) Dorsal (Posterior) Caudal (Inferior) Ventral (Anterior) Cranial (Superior) Ventral (Anterior)

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