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Thorax Muscles

Trunk and Lumbar

QuestionAnswer
Rectus Abdominis origin? Pubic Symphosis
Rectus Abdominus Insertion? Ribs 5-7 and Xiphoid process
Rectus Abdominus Action? Trunk flexion, pelvic posterior tilt (bilateral), Lateral Flexion (ipsilatieral)
Rectus Abdominus Nerve? Last 6 intercostals
Obliquus Externus origin? Last 8 ribs
Obliquus Externus Insertion? Rectus sheath, inguinal ligament, iliac crest
Obliquus Externus Action? Trunk flexion and posterior pelvic tilt (bilateral), lateral flexion and pelvic elevation (ipsilateral), trunk rotation (contralateral)
Obliquus Externus Nerve? Last 7 intercostals
Obliquus internus origin? Inguinal ligament, iliac crest and thoracolumbar fascia
Obliquus internus insertion? Pubic crest, lower ribs, and rectus sheath
Obliquus internus action? Trunk flexion and pelvic posterior tilt (bilateral), rotation, lateral flexion, and pelvic elevation (ipsilateral)
Obliquus internus nerve? Last 3 intercostals
Quadratus Lumborum origin? Iliac crest
Quadratus Lumborum Insertion? Transverse processes, 12th rib
Quadratus Lumborum Action? Trunk extension and pelvic anterior tilt (bilateral), lateral flexion and pelvic elevation (ipsilateral)
Quadratus Lumborum Nerve? T12, L1-L3 from lumbar plexus
Diaphragm origin? Xiphoid process, last 7 ribs,1st four lumbar vertebra
Diaphragm insertion? Central tendon
Diaphragm action? -Principal muscle of respiration -Draws central tendon downwards
Diaphragm nerve? Phrenic (C3-C5)
External intercostals origin? Inferior border of rib above
External intercostals insertion? Superior border of rib below
External intercostals action? Elevates ribs during inspiration
External intercostals nerve? Intercostals
Levatores costarum longi and breves origin? Transverse process of C7, T1-T11
Levatores costarum longi and breves insertion? Rib one or two below
Levatores costarum longi and breves action? Elevates ribs, lateral flexion and extension of spine
Levatores costarum longi and breves nerve? Dorsal Rami
Serratus posterior superior origin? Spinous processes of C7-T3
Serratus posterior superior insertion? Ribs 2-5
Serratus posterior superior action? Elevation of ribs
Serratus posterior superior nerve? Intercostals 2-5
Serratus posterior inferior origin? Spinous processes T11-L3
Serratus posterior inferior insertion? Last four ribs
Serratus posterior inferior action? Depresses ribs
Serratus posterior inferior nerve? Intercostals 9-12
Internal intercostals origin? Superior border of rib below
Internal intercostals insertion? Inferior border of rib above
Internal intercostals action? Depresses ribs during expiration
Internal intercostals nerve? Intercostals
Subcostals origin? Rib
Subcostals insertion? rib
Subcostals action? depresses rib
Subcostals nerve? intercostals
Transversus abdominis origin? Last 6 ribs, iliac crest, inguinal ligament, thoracolumbar fascia
Transversus abdominis insertion? Pubic bone and rectus sheath
Transversus abdominis action? -Constricts abdominal contents -Assists in forced expiration -Helps to stabilize the trunk
Transversus abdominis nerve? Last 6 intercostals
Transversus thoracis origin? Distal 1/3 sternum, cartilage of ribs 4-7
Transversus thoracis insertion? Cartilage of ribs 2-6
Transversus thoracis action? Depress ribs
Transversus thoracis nerve? Intercostals
Created by: rmart11
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