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Spine Anatomy
| Question | Answer |
|---|---|
| What is the origin for the trapezius | external occipital protuberance, middle 1/3rd superior nuchal line, nuchal line, sp c7-t12 |
| What is the insertion for the trapezius | lateral 1/3rd of the clavicle, spine of scapula, acromion process |
| What is the innervation for trapezius muscle | Spinal accessory nerve CN 11 ventral rami c3-c4 |
| What is the origin for the latissimus dorsi? | T6-L5, iliac crest, ribs 8-12, sacrum, thoracolumbar fascia |
| What is the insertion for the latissimus dorsi | Intertubercular groove of humerus |
| What is the action of the trapezius | scapular elevation, scapular retraction, scapular depression, ipsilateral lateral flexion, head and neck extension |
| What is the innervation of the latissimus dorsi | thoracodorsal nerve c6-c8 |
| What is the action of the latissimus dorsi | internal rotation, adduction, extension |
| what is the origin for the levator scapulae | posterior tubercles TP c1-c4 |
| what is the insertion for the levitator scapulae | superior angle of the scapula |
| what is the innervation for the levator scapulae | dorsal scapular c5 ventral rami c3-c4 |
| what is the action of the levator scapulae | elevation, downward rotation, ipsilateral lateral flexion of neck |
| rhomboid minor- origin | c7-t1 |
| rhomboid minor- insertion | medial border of the scapula at the scapular spine |
| rhomboid minor innervation | dorsal scapular c5 |
| rhomboid minor action | elevation, retraction, downward rotation, helps fix scapular to thoracic cage |
| rhomboid major origin | t2-t5 |
| rhomboid major insertion | medial border of the scapula at the scapular spine |
| what kind of muscles are the rhomboids and levator scapulae | intermediate extrinsic 2 |
| serratus posterior superior muscle origin | ligamentum nuchae, sp c7-t3 |
| serratus posterior superior muscle insertion | upper borders of ribs 2-5 |
| innervation of serratus posterior superior muscle | 1-4 intercostal nerve ventral rami t1-t4 |
| action of serratus posterior superior muscle | elevates 2-5th rib deep inspriration |
| what kind of muscles are the serratus posterior superior and serratus posterior inferior | deep extrinsic 3 |
| serratus posterior inferior muscle origin | t11-l3 |
| serratus posterior inferior muslce insertion | ribs 9-12 |
| innervation of serratus posterior inferior muscle | 9-12 intercostal nerve ventral rami t9-t12 |
| action of serratus posterior inferior muscle | deep expiration depresses the lower four ribs |
| what are layers 1-3 innervated by | ventral rami |
| splenius capitis muscles origin | ligamentum nuchae c7-t3 |
| splenius capitis muscles insertion | mastoid process nuchal line lateral 3rd |
| innervation of splenius capitis | dorsal rami c1-t1 |
| action of spelenius capitis | b/l contraction causes head extension u/l contraction causes ipsilateral rotation and ipsilateral lateral flexion |
| spelnius cervicis muscles origin | t3-t6 |
| splenius cervicis muscle insertion | tp c1-c3 |
| spelenius cervicis muscle innervation | dorsal rami in area |
| action of splenius cervicis | b/l contraction causes neck extension u/l contraction causes ipsilateral rotation and ipsilater lateral flexion |
| both splenius muscles are what | superficial intrinsic 4 |
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