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25 Cards in this Set
- Front
- Back
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Rhomboids action
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Act together (and with middle trapezius fibers) to retract scapula, thus “squaring shoulders”; rotates downward (as when arm is lowered against resistance; e.g., paddling a canoe); stabilize scapula
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Rhomboids innervation
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Dorsal scapular nerve (C5)
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Trapezius origin and insertion
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origin: Occipital bone, ligamentum nuchae, and spines of C7 and all thoracic vertebrae; insertion: A continuous insertion along acromion and spin of scapula and lateral third of clavicle
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Levator Scapulae action
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Elevates/adducts scapula in concert with superior fibers of trapezius; tilts
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Levator Scapulae innervation
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Cervical spinal nerves and dorsal scapular nerve (C3-C5)
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Subclavius origin and insertion
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origin: Costal cartilage of rib 1; insertion: Groove on inferior surface of clavicle
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Trapezius action
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Stabilizes, raises, retracts, and rotates scapula; middle fibers retract (adduct) scapula; superior fibers elevate scapula or can help extend head; inferior fibers depress scapula (and shoulder)
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Trapezius innervation
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Accessory nerve (C3, C4)
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Serratus Anterior origin and insertion
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origin: By a series of muscle slips from ribs 1-8 (or 9); insertion: Entire anterior surface of vertebral border of scapula
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Subclavius action
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Helps stabilize and depress pectoral girdle; paralysis produces no obvious effects
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Subclavius innervation
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Nerve to Subclavius (C5, C6)
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Pectoralis Minor origin and insertion
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origin: Anterior surfaces of ribs 3-5; insertion: Coracoid process of Scapula
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Serratus Anterior action
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Prime mover to protract and hold scapula against chest wall; rotates scapula so that its inferior angle moves laterally and upward; raises point of shoulder; important role in abduction and raising of arm and in horizontal arm movements (pushing, punching); called “boxer’s muscle”
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Serratus Anterior innervation
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Long Thoracic Nerve (C5-C7)
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Diaphragm origin and insertion
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origin: Inferior border of rib cage and sternum, costal cartilages of last six ribs and lumbar vertebrae; insertion: Central tendon
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Pectoralis Minor action
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With ribs fixed, draws scapula forward and downward; with scapula fixed, draws rib cage superiorly
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Pectoralis Minor innervation
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Medial Pectoral Nerve (C6-C8)
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Internal Intercostals origin and insertion
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origin: Superior border of rib below; insertion: Inferior border (costal groove) of rib above
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Diaphragm action
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Prime mover of inspiration; flattens on contraction, increasing vertical dimensions of thorax; when strongly contracted, dramatically increases intra-abdominal pressure
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Diaphragm innervation
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Phrenic nerves
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External Intercostals origin and insertion
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origin: Inferior border of rib above; insertion: Superior border of rib below
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Internal Intercostals action
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With 12th ribs fixed by quadratus lumborum, muscles of posterior abdominal wall and oblique muscles of the abdominal wall, draw ribs together and depress rib cage; aid in expiration; antagonistic to external intercostals
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Internal Intercostals innervation
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Intercostal nerves
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Quadratus Lumborum origin and insertion
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origin: Iliac crest and iliolumbar fascia; insertion: Transverse processes of upper lumbar vertebrae and lower margin of 12th rib
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External Intercostals action
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With first ribs fixed by scalene muscles, pull ribs toward one another to elevate rib cage; aids in inspiration; synergists of diaphragm
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