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Trunk muscle orgins
Anatomy Trunk Muscle's Orgins
| Question | Answer |
|---|---|
| Splenius | inferior half of nuchal ligament, spinous processes T1-T6 |
| erector spinae | spinous processes of sacral and lumbar vertebrae, iliac crest, and posterior sacrum |
| semispinalis | transverse processes of cervical and thoracic vertebrae |
| multifidus | transverse process of sacral, lumbar, thoracic, and cervical vertebrae |
| internal intercostal muscles | 11 pairs of muscles filling the space between ribs, with fibers running in the same direction as the internal obliques |
| external intercostal muscles | 11 pairs of muscles filling the space between ribs, with fibers running in the same direction as the external obliques |
| transversus thoracis | posterior surface of the sternum |
| rectus abdominis | pubic bone |
| external obliques | lower 8 ribs |
| internal obliques | thoracolumbar fascia, iliac crest, inguinal ligament |
| transversus abdominis | lower 8 ribs, thoracolumbar fascia, inguinal ligament, and iliac crest |
| quadratus lumborum | iliac crest |
| levator ani | medial surface of pelvis, from pubis to ischial spine |
| diaphragm | inferior border of rib cage, costal cartilages of ribs 6-12, and lumbar vertebrae |
| transverse perineus | medial surface of ischial rami, and inferior pubic rami |
| external urethral sphincter | loops around urethra and vagina (females) and around membranous urethra in male |
| external anal sphincter | attached anteriorly to central tendon, posteriorly to coccyx; loops around and attaches to anal canal. |