Anatomy Lab: Muscles of the Abdomen, Trunk Wall

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Last updated 5:26 AM on 9/25/26
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11 Terms

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external oblique

unilateral contraction does contralateral rotation, unilateral flexion

bitrunk flexion

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internal oblique

unilateral contraction does ipsilateral rotation, unilateral flexion

bitrunk flexion

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transversus abdominus

compress abdominal cavity

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rectus abdominus

trunk flexion

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erector spinae

iliocostalis, longissimus, spinalis

trunk extension

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external intercostals

elevate ribs for passive inhalation

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internal intercostals

depress ribs for forced exhalation

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serratus posterior superior

elevate ribs for forced inhalation

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serratus posterior inferior

depress ribs for forced exhalation

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diaphragm

expands and increases vertical dimension of the thoracic cavity, increases pressure in adbominopelvic cavity

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diaphragm innervated by?

phrenic nerve