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9 Cards in this Set
- Front
- Back
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External intercostals
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O: inferior border of rib
I: superior border of rib below -run from post-sup to ant-inf, and extend from costal tubercle of external intercostal membrane Innervation: intercostal nerves Action: elevate ribs in inspiration |
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Internal intercostals
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O: lower border of ribs
I: upper border of rib below -runs from ant-sup to post-inf, extend from the sternum to the internal intercostal membrane posteriorly. Innervation: intercostal nerves Action: interchondral part elevates ribs (inspiration), intercostal part depresses ribs (expiration) |
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innermost intercostals
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O: lower border of ribs
I: upper border of rib below Innervation: intercostal nerves Action: elevate ribs |
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subcostalis
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O: inner surface of lower ribs near angles
I: upper borders of ribs 2 or 3 below Innervation : intercostal nerves Action: elevates ribs |
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Levator costarum
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O: transverse processes of T7-T9
I: rib below at their angle Innervation: dorsal primary rami of C8- T11 Action: elevates ribs |
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transversus thoracis
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O: posterior surface of sternum and xyphoid
I: inner surface of costal cartilages 2-6 Innervation: intercostal nerves Action: depresses ribs |
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Diaphragm
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O: xiphoid process, lower 6 costal cartilages, lumbocostal arches, vertibrae L1-L3
I: central tendon Innervation: phrenic Action: increase thoracic volume for inspiration |
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Pectoralis Major
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O: medial clavicle, sternum, upper six costal cartilages
I: intertubercular groove of humerus Innervation: medial and lateral pectoral nerves Action: flexes, adducts, medially rotates arm, and elevates ribs |
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Pectoralis Minor
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O: ribs 3,4,5
I: coracoid process of scapula Innervation: medial ad lateral pectoral nerves Action: depresses scapula, elevates ribs |
