Term
| Muscle: Internal Intercostal |
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Definition
Origin: Inferior margin of ribs 1-11
Course: Down and Laterally
Insertion: Superior surface of the rib below
Innervation: Intercostal Nerves
Function: Depresses ribs 1-11 |
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Term
| Muscle: Innermost Intercostal |
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Definition
Origin: Superior margin of ribs 1-11
Course: Down and laterally
Insertion: Superior surface of the rib below
Innervation: Intercostal nerves
Function: Depresses ribs 1-11 |
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Term
| Muscle: Transversus Thoracis |
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Definition
Origin: Inner thoracic lateral margin of the sternum
Course: Laterally
Insertion: Surface of ribs 2-6
Innervation: Thoracic intercostal nerves
Function: Depresses the rib cage |
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Term
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Definition
Origin: Inner posterior thorax
Course: Down and lateral
Insertion: Inner surface of second or third rib below
Innervation: Intercostal nerves
Function: Depresses the thorax |
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Term
| Muscle: Serratus Posterior Inferior |
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Definition
Origin: Spinous process of T11, T12, L1-L3
Course: Up and lateral
Insertion: Lower margin of ribs 7-12
Innervation: Intercostal nerves
Function: Pulls the rib cage down |
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Term
| Muscle: Transverse Abdominis |
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Definition
Origin: Abdominal wall at the vertebral column
Course: Lateral
Insertion: inner surface of ribs and at the pubis
Innervation: Thoracic and lumbar nerves
Function: Compresses abdomen |
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Term
| Muscle: Internal Oblique Abdominis |
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Definition
Origin: Inguinal ligament and iliac crest
Course: Fans medially
Insertion: Lower ribs
Innervation: Thoracic and lumbar nerves
Function: Rotates trunk, flexes trunk, compresses abdomen |
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Term
| Muscle: External Oblique Abdominis |
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Definition
Origin: Osseous portion of the lower 7 ribs
Course: Fans downward
Insertion: Iliac crest, inguinal ligament, rectus abdominis
Innervation: Subcostal nerve
Function: Bilateral contraction flexes vertebral column and compresses abdomen; unilateral contraction results in trunk rotation |
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Term
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Definition
Origin: Originates at pubis
Course: Up
Insertion: Xiphoid process of sternum, lower ribs
Innervation: Intercostal nerves
Function: Flexion of vertebral column |
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Term
| Muscle: Quadratus Lumborum |
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Definition
Origin: Iliac crest
Course: Fans up and in
Insertion: Transverse processes of the lumbar vertebrae and rib 12
Innervation: Thoracic nerve and lumbar nerves
Function: Bilateral contraction fixes the abdominal wall in support of abdominal compression |
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Term
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Definition
Origin: Lumbar, sacral, and lower thoracic vertebrae
Course: Fans up
Insertion: Humerus
Innervation: Brachial plexus
Function: Stabilizes the posterior abdominal wall |
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