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Muscles of the Thorax and Abdomen
Fuctions
12
Anatomy
Undergraduate 1
04/24/2011

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Cards

Term
External Intercostals
Definition
Inspiration: elevate and protract ribs
Term
Internal Intercostals
Definition
Costal Portion: forced expiration - depress ribs
Sternal (inter-cartilaginous) portion: aides in elevating ribs during inspiration
Term
Innermost Intercostals
Definition
Presumed to follow internal intercostal actions of forced expiration
Term
Transverses Thoracis
Definition
Depresses ribs during forced expiration
Term
Diaphragm
Definition
Contractions flatten out the usually convex structure of the diaphragm.
This increases of the volume of the thoracic cavity
Term
Rectus Abdominis
Definition
Flexion of Trunk
Term
External Oblique
Definition
Lateral flexion of trunk, rotation and compression of abdominal organs
Term
Internal Oblique
Definition
Lateral flexion of trunk, rotation and compression of abdominal orgins
Term
Transversus Abdominus
Definition
Lateral flexion of trunk, rotation, and compression of abdominal organs
Term
Quadratus Lumborum
Definition
Stabilizes rib 12, extends and laterally flexes vertebral column
Term
Psoas Major
Definition
Flexes hip/trunk
Term
Psoas Minor
Definition
Weak flexor of hip and trunk ( in 50-60% of people)
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