Lab 5 - Trunk and Lower Extremity

Lab 5 - Trunk and Lower Extremity - Muscles of the Trunk...

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Muscles of the Trunk and Lower Extremity PET 3322 – Anatomy & Physiology 1
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External Oblique Location : Lateral abdomen Fibers run diagonally in and down Action : Trunk Movement Flexion Abdominal compression Lateral rotation Lateral flexion Origin : Lower ribs Insertion : Linea alba, iliac crest and pubic crest
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Internal Oblique Location : Lateral abdomen Fibers run diagonally in and up Action : Trunk movement Flexion Abdominal compression Lateral rotation Lateral flexion Origin : Iliac crest and inguinal ligament Insertion : Linea alba, pubic crest, last ribs
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Transverse Abdominus Location : Deepest abdominal muscle Fibers run horizontally Action : Compresses abdomen Origin : Inguinal ligament, iliac crest, last 6 ribs Insertion : linea alba, pubic crest
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Rectus Abdominus Location : Medial, s uperficial abdomen Action : Stabilizes pelvis Stabilizes and depresses ribs Moves trunk Flexion Rotatotion Origin : Insertion : Xiphoid process, ribs 5-7
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Diaphragm Location : Forms floor of thoracic cavity Action : Prime mover for inspiration Origin : Inferior internal rib cage & sternum, last 6 ribs, lumbar vertebrae Insertion : Central tendon
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External Intercostals Location : Between ribs (11 pairs) Fibers run obliquely (down & forward) from each rib to rib below Action : Moves rib cage Elevates during inspiration Synergist of Diaphragm Origin : Inferior border of rib above Insertion : Superior border of rib below
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Internal Intercostals Location : Between ribs (11 pairs) Fibers run deep to external intercostals Action : Moves rib cage Antagonist to External Intercostals Depresses rib cage Origin : Superior border of rib below Insertion : Inferior border of rib above
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Sternocleidomastoid Location : anterolateral neck (two-headed muscle) Action : Prime mover: head flexion Rotates head to opposite shoulder Tilts head laterally to own side Origin : manubrium and medial clavicle Insertion : Mastoid process
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Iliopsoas Location : Anterior pelvis Iliacus : lateral, fan shaped muscle Psoas Major : thicker, longer, medial muscle Action : Prime mover of hip flexion Lateral flexion of vertebral column (important
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This note was uploaded on 04/14/2008 for the course PET 3322L taught by Professor Rich during the Spring '08 term at FSU.

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Lab 5 - Trunk and Lower Extremity - Muscles of the Trunk...

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