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Thorax Muscles

HintAnswer
serratus posterior superior: origin C7-T3 spinous processes
serratus posterior superior: insertion superior borders of ribs 2-5
serratus posterior superior: action elevates ribs
serratus posterior superior: innervation intercostal nerves
serratus posterior inferior: origin T11-L2 spinous processes
serratus posterior inferior: insertion inferior borders of ribs 8-12
serratus posterior inferior: action depress ribs
serratus posterior inferior: innervation intercostal nerves
levator costarum: origin C7- T11 transverse processes
levator costarum: insertion superior borders of ribs below transverse process of origin
levator costarum: action elevate ribs
levator costarum: innervation dorsal primary rami
external intercostals: origin inferior borders of ribs
external intercostals: insertion superior borders of ribs below origin (fibers run inferoanteriorly)
external intercostals: action elevate ribs
external intercostals: innervation intercostal nerves
internal intercostals: origin inferior borders of ribs
internal intercostals: insertion superior borders of ribs below origin (fibers run inferoposteriorly)
internal intercostals: action depress ribs
internal intercostals: innervation intercostal nerves
innermost intercostals: origin inferior borders of ribs
innermost intercostals: insertion superior borders of ribs below origin (fibers run inferoposteriorly)
innermost intercostals: action depress ribs
innermost intercostals: innervation intercostal nerves
transversis thoracis: origin xiphoid process, sternum, costal cartilages
transversis thoracis: insertion costal cartilages 2-6
transversis thoracis: action depress ribs
transveris thoracis: innervation intercostal nerves
subcostals: origin internal surface of lower ribs near their angles
subcostals; insertion superior borders of ribs below origin
subcostals: action elevate ribs
subcostals: innervation intercostal nerves
Created by: JillLindelow
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