Muscle Anatomy: Muscles of Vertebral Column Flashcards
What are the muscles of the vertebral column?
- Splenius capitis
- Erector spinae: spinalis, longissimus, iliocostalis
- Quadratus lumborum
What are the muscles of the erector spinae?
Spinalis, longissimus, iliocostalis
Where does the spinalis orignate?
Spinous and transverse processes of thoracic and superior lumbar vertebrae,
Where is the insertion of the spinalis?
Spinous processes of superior thoracic vertebrae
What action does the spinalis perform?
Extend vertebral column
Where does the longissimus originate?
Transverse processes of inferior cervical, thoracic and lumbar vertebrae
Where is the insertion of the longissimus?
Mastoid process of temporal bone, transverse process of middle and superior cervical and thoracic vertebrae;inferior surfaces of ribs
What action does the longissimus perform?
Two sides extend the vertebral column; alone, each rotates and laterally flexes it to that side
Where does the iliocostalis originate?
Superior borders of ribs, iliac crests, and spinous processes of lumbar vertebrae
Where is the insertion of the iliocostalis?
transverse processes of middle and inferior cervical vertebrae; inferior surfaces of inferior seven ribs
What action does the iliocostalis perform?
Extend or laterally flex vertebral column, elevate or depress ribs
Where does the quadratus lumborum originate?
Iliac crest
Where is the insertion of the quadratus lumborum?
Last rib and transverse processes of lumbar vertebrae
What action does the quadratus lumborum perform?
Together, they depress ribs; alone, each side laterally flexes vertebral column
