OIAI: Pelvis/Abdomen

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Last updated 3:54 PM on 7/19/26
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8 Terms

1
New cards

Name the origin, insertion, and action of the External obliques

O: Ribs 5-12

I: Iliac crest, inguinal ligament, linea alba, pubic tubercle

A: Bilaterally → anterior flexion of the trunk and compression of the abdomen

Unilaterally → lateral flexion of the trunk and rotation to the opposite side

<p>O: Ribs 5-12</p><p>I: Iliac crest, inguinal ligament, linea alba, pubic tubercle</p><p>A: Bilaterally → anterior flexion of the trunk and compression of the abdomen</p><p>Unilaterally → lateral flexion of the trunk and <strong>rotation to the opposite side</strong></p>
2
New cards

Name the origin, insertion, and action of the Internal obliques

O: Iliac crest, inguinal ligament, thoracolumbar fascia

I: Ribs 10-12, pectineal line, linea alba, and abdominal aponeurosis (fuses with external oblique to become the rectus sheath)

A: Bilaterally → anterior flexion of the trunk and compression of the abdomen

Unilaterally → lateral flexion of the trunk and rotation to the same side

<p>O: Iliac crest, inguinal ligament, thoracolumbar fascia</p><p>I: Ribs 10-12, pectineal line, linea alba, and abdominal aponeurosis (fuses with external oblique to become the rectus sheath)</p><p>A: Bilaterally → anterior flexion of the trunk and compression of the abdomen</p><p>Unilaterally → lateral flexion of the trunk and <strong>rotation to the same side</strong></p>
3
New cards

Name the origin, insertion, and action of the Transverse abdominis

O: Iliac crest, thoracolumbar fascia, costal cartilage of ribs 7-12

I: Abdominal aponeurosis (and other midline structures)

A: Compression and tension of abdominal wall

<p>O: Iliac crest, thoracolumbar fascia, costal cartilage of ribs 7-12</p><p>I: Abdominal aponeurosis (and other midline structures)</p><p>A: Compression and tension of abdominal wall</p>
4
New cards

Name the origin, insertion, and action of the Rectus abdominis

O: Pubic crest, tubercle, and symphysis

I: Costal cartilages 5-7, xiphoid process

A: Flexion of the trunk

<p>O: Pubic crest, tubercle, and symphysis</p><p>I: Costal cartilages 5-7, xiphoid process</p><p>A: Flexion of the trunk</p>
5
New cards

Name the origin, insertion, and action of the Quadratus lumborum

O: Iliac crest

I: Transverse processes L1-L5; rib 12

A: Bilaterally → extension of the trunk - but likely primarily contributes to stability of the lumbar spine

Unilaterally → lateral flexion

<p>O: Iliac crest</p><p>I: Transverse processes L1-L5; rib 12</p><p>A: Bilaterally → extension of the trunk - but likely primarily contributes to stability of the lumbar spine</p><p>Unilaterally → lateral flexion</p>
6
New cards

Name the origin, insertion, and action of the Puborectalis (part of levator ani group)

O: Anteriorly, from the pubic symphysis

I: Posteriorly, encircling the anorectal junction (integrating in part with the external butthole)

A: Inhibits deification

<p>O: Anteriorly, from the pubic symphysis</p><p>I: Posteriorly, encircling the anorectal junction (integrating in part with the external butthole)</p><p>A: Inhibits deification </p>
7
New cards

Name the origin, insertion, and action of the Pubococcygeus (part of levator ani group)

O: Pubic bone (lateral to the origin of the puborectalis)

I: Coccyx

A: Control urine flow; contract during orgasm

<p>O: Pubic bone (lateral to the origin of the puborectalis)</p><p>I: Coccyx</p><p>A: Control urine flow; contract during orgasm</p>
8
New cards

Name the origin, insertion, and action of the Iliococcygeus (part of levator ani group)

O: Pubic bone (lateral to the origin of puborectalis)

I: Coccyx

A: Control urine flow; contract during orgasm

<p>O: Pubic bone (lateral to the origin of puborectalis)</p><p>I: Coccyx</p><p>A: Control urine flow; contract during orgasm</p>