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What three muscle groups make up the erector spinae in the 1st layer?
- Illiocostalis (most lateral)
- Longissimus
- Spinalis (most medial)
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What type of muscles are the erector spinae?
Type 1 muscles
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What are the illiocostalis subgroups?
Lumborum, Thoracic and Cervicis
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What are the longissimus subgroups?
thoracic, cervicis, capitis
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What are the spinalis subgroups?
thoracis, cervicis, capitis
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What are the four transversospinal groups?
- Semispinalis
- Multifidus
- Rotator Brevis
- Rotator Longus
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What are the relationships between the transversospinalis muscles?
They all originate at the transvers process and attach to spinous process
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Which transversospinalis muscles are longest and shortest?
- Semispinalis is longest
- Rotator brevis is shortest
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What are the most superficial and deepest transversospinalis muscles?
- Semispinalis = superficial
- Rotator Brevis = deepest
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How many deep neck layers are there?
Four
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What are the second, third, and fourth layers?
- 2nd = splenious
- 3rd = Semispinalis capitis and spinal capitis
- 4th = Semispinalis cervicis and suboccipital muscles
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What is the origin and insertion of rectus capitis posterior major?
C2 to inferior nuchal line
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What forms the boundaries of the occipital triangle?
- rectus capitis posterior major (runs superior and oblique)
- Obliquus capitis superior (most lateral )
- Obliquus capitis inferior (most inferior)
- floor = posterior arch C1, Posterior atlanto axial and atlantooccipital membrane
- Roof = semispinalis capitis
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where is the location of the semispinalis cervicis?
Deep to the semispinalis capitis
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What are the contents of the suboccipital triangle?
vertebral artery, suboccipital nerve
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