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9 Cards in this Set
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- Back
- 3rd side (hint)
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External intercostals
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Orig: between adjacent ribs
Ins: between adjacent ribs, downward and forward |
Action: Elevate ribs during inspiration Stabilize chest wall during respiration N: Corresponding intercostal nerves |
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Internal intercostals
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Orig: between adjacent ribs
Ins: between adjacent ribs, downward and backward |
Action: Depress ribs during expiration Stabilize chest wall during respiration N: Corresponding intercostal nerves |
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Innermost intercostals
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Orig: between adjacent ribs
Ins: between adjacent ribs, downward and backward |
Action: Depress ribs during expiration Stabilize chest wall during respiration N: Corresponding intercostal nerves |
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Transverse thoracis
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Orig: Lower third of posterior sternal surface
Xiphoid process and costal cartilates of ribs 4 or 5-7 Ins: Costal cartilages of ribs 2-6 |
Action: Depresses costal cartilages during expiration N: Adjacent intercostal nerves |
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Levatores costarum
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Orig: tipe of C7-T11 transverse processes
Ins: descend laterally to rib below |
Action: elevate ribs during respiration N: DORSAL RAMI of corresponding thoracic spinal nerves |
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External abdominal oblique
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Orig: Outer surfaces and lower borders of ribs 5-12 interdigitating with serratus anterior above and latissimus dorsi below
Ins: Anterior half of outer lip of iliac crest Linea alba |
Action: acting bilaterally, trunk flexion, assist in respiration, posterior pelvic tilt Acting unilaterally, laterally flex vertebral column to same side, (with pelvis fixed) rotate ertebral column to OPPOSITE side N: 7th - 12th intercostal nerves |
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Internal abdominal oblique
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Orig: anterior 2/3 of intermediate line of iliac crest
Lateral 2/3 of inguinal ligament Thoracolumbar fascia Ins: Posterior fibers to inferior borders of lower 3 or 4 ribs Intermediate fibers to outer surfaces and lower borders of 7th-9th costal cartilages and linea alba Lowest fibers curve downward and medially to pubic crest and pecten pubis |
Action: Acting bilaterally, trunk flexion, respiration, support Acting unilaterally, lateral flex vertebral column to same side. (With pelvis fixed) rotate vertebral column to same side N: 7th - 12th intercostal and 1st lumbar nerves |
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Transversus abdominis
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Orig: Inner surfaces of lower 6 costal cartilages
Anterior 2/3 of inner lip of lliac crest Lateral third of inguinal ligament Thoracolumbar fascia Ins: Linea alba Lowest fibers curve downward and medially to pubic crest and pecten pubis |
Action: acts like a girdle to flatten abdominal wall and compress viscera Upper portion helps decrease infrasternal angle of ribs No action for lateral trunk flexion N: 7th - 12th intercostal and 1st lumbar nerves |
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Rectus abdominis
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Orig: Pubic tubercle, crest and symphysis
Ins: 5th-7th costal cartilages Side of xiphoid process |
Action: N/A N: 6th - 12th intercostal nerves |
