MSA2 Erector Spinae

Card Set Information

Author:
barbostick
ID:
83386
Filename:
MSA2 Erector Spinae
Updated:
2011-05-02 22:45:14
Tags:
Soma MSA2 erector spinae muscles LP
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Description:
Erector Spinae muscles
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  1. Spinalis
    • Most medial
    • Origin: Thoracolumbar aponeurosis, SPs of upper lumbar and lower thoracic vertebrae, Ligamentum nuchae
    • Insertion: Ascending SPs except C1
    • Bilateral action: Extends the head and spine
    • Unilateral actions: ipsilateral lateral flexion of neck and trunk (bending side to side)
    • Nonropy
    • Deep to trap, lats, and part of longissimus
  2. Longissimus
    • Dense, feels ropy
    • Origin: Thoracolumbar aponeurosis; TVPs thoracic region
    • Insertion: Ascending TVPs, mastoid process
    • Bilateral action: extends head and spine (primary)
    • Unilateral actions: ipsilateral lateral flexion of neck and trunk; ipsilateral rotation of head and neck
    • Nonropy
    • Deep to traps and lats
  3. Iliocostalis
    • Very flat and broad
    • Origin: Thoracolumbar aponeurosis; iliac crest
    • Insertion: Ascending rib to rib; loweral cervical TVPs (ends by medial border of the scap)
    • Bilateral action: extends the spine
    • Unilateral actions: Ipsilateral lateral flexion of neck and trunk (where it crosses C7); ipsilateral rotation of neck
    • Nonropy
    • Deep to trap and lat

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