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9 Cards in this Set

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  • Back
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External intercostals
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
Internal intercostals
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
Innermost intercostals
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
Transverse thoracis
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
Levatores costarum
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
External abdominal oblique
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
Internal abdominal oblique
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
Transversus abdominis
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
Rectus abdominis
Orig: Pubic tubercle, crest and symphysis

Ins: 5th-7th costal cartilages
Side of xiphoid process
Action: N/A

N: 6th - 12th intercostal nerves