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6 Back Muscle Layers
FAB - Back Layers
Question | Answer |
---|---|
What muscles are in the 1st layer? | Trapezius & Latissumus dorsi |
What muscles are in the 2nd layer? | Levator Scapula; Rhomboid major& minor |
What muscles are in the 3rd layer? | Serratus posterior superior & inferior |
What muscles are in the 4th layer? | Splenius capitis & cervicis |
What muscles are in the 5th layer? | 3 Iliocostalis, 3 Longissimus, 3 Spinalis |
What muscles are in the 6th layer? | 3 Semispinalis, 3 Multifidis, 3 Rotatores |
What are the 3 Iliocostalis muscles? | Lumborum, Thoracis, Cervicis |
What are the 3 longissimus muscles? | Thoracis, cervicis, capitis |
What are the 3 spinalis muscles? | Thoracis, cervicis, capitis |
What are the 3 semispinalis muscles? | Thoracis, cervicis, capitis |
What are the 3 multifidus muscles? | lumborum, thoracis, cervicis |
What are the 3 rotatores muscles? | lumborum, thoracis, cervicis |
Serratus Posterior Superior O | Lower portion of ligamentum nuchae, SP of C7-T3, supraspinous ligaments |
Serratus Posterior Superior I | ribs 2-5 |
Serratus Posterior Superior N | Ventral rami T2-T5 |
Serratus Posterior Superior A | Elevates ribs 2-5 |
Serratus Posterior Inferior O | SP |
Serratus Posterior Inferior I | ribs |
Serratus Posterior Inferior N | Ventral rami of T9-T12 |
Serratus Posterior Inferior A | Depress ribs 9-12, aids respiration |
Splenius capitis O | SP |
Splenius capitis I | Mastoid process; temporal bone; occiput below lateral part of superior nuchal line |
Splenius capitis A | Extend head bilaterally; lateral flex and rotate face to same side, unilaterally |
Splenius capitis N | lat. branches of dorsal rami of C5-C7 |
Which back muscles are "Erector spinae muscles"? | Iliocostalis lumborum, |
Erector spinae muscles common origin | SP and supraspinous ligament of T11-L5; median sacral crest; sacrotuberous ligament; posterior sacroiliac ligament; lateral sacral crest; posteromedial iliac crest |
Erector spinae muscles | 5th layer |
Splenius cervicis O | SPs |
Splenius cervicis I | TPs |
Splenius cervicis A | extend neck bilaterally; unilaterally lateral flex and rotate face toward same side |
Splenius cervicis N | lat. branches of dorsal rami of C5-C7 |
Iliocostalis lumborum O | common origin of erector spinae muscles |
Iliocostalis lumborum I | ribs |
Iliocostalis thoracis O | ribs |
Iliocostalis thoracis I | ribs and TP of C7 |
Iliocostalis cervicis O | ribs |
Iliocostalis cervicis I | TP |
Longissimus thoracis O | Common origin of erector spinae; TP's and AP's of Lumbar vertebrae |
Longissimus thoracis I | 3rd-12th ribs; TPs |
Longissimus cervicis O | TPs |
Longissimus cervicis I | TPs and APs |
Longissimus capitis O | TPs; APs |
Longissimus capitis I | mastoid process temporal bone |
Spinalis thoracis O | SPs |
Spinalis thoracis I | SPs |
Spinalis cervicis O | SPs |
Spinalis cervicis I | SPs |
Spinalis capitis O | TPs ; APs , sometimes SP of C7 & T1 |
Spinalis capitis I | Occiput btwn superior and inferior nuchal lines |
Action of Iliocostalis and Longissimus muscles | Extend and laterally flex spine. |
Nerves of Erector spinae muscles | Dorsal rami |
Action of spinalis thoracis and cervicis | Extend spine |
Action of spinalis capitis | extend head |