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36 Cards in this Set
- Front
- Back
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Extrinsic (superficial) back muscles - derivation
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embryonic ventral muscle mass
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Extrinsic (superficial) back muscles - innervation
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nerves derived from ventral primary rami
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Extrinsic (superficial) back muscles - blood supply
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branches of subclavian and axillary aa.
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Extrinsic (superficial) back muscles - actions
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move upper extremity (pectoral girdle, arm); assist respiration
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Intrinsic (deep) back muscles - derivation
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embryonic dorsal muscle mass
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Intrinsic (deep) back muscles - innervation
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directly by dorsal primary rami
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Intrinsic (deep) back muscles - blood supply
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dorsal branches of segmental arteries
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Intrinsic (deep) back muscles - actions
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move trunk and head; maintain posture
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Trapezius m. - origin/insertion
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O: medial third of superior nuchal line, external occipital protrubrance, ligamentum nuchae, T1-T12 spinous processes; I: spine of scapula, acromion, lateral third of clavicle
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Trapezius m. - actions
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elevate and retract pectoral girdle; superiorly rotate scapula
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Trapezius m. - innervation
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spinal accessory n. (CNXI) > motor; C3-C4 ventral rami via cervical plexus > sensory (pain, proprioreception)
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Trapezius m. - blood supply
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Transverse cervical a.
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Latissimus dorsi m. - origin/insertion
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O: T7-L5 spinous procesess, thoracolumbar fascia, dorsal sacrum, iliac crest; I: floor of intertubercular sulcus of humerus
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Latissimus dorsi m. - actions
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extends, adducts, medially rotates humerus; (depresses, retracts, inferiorly rotates scapula)
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Latissimus dorsi m. - innervations
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Thoracodorsal n.
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Latissimus dorsi m. - blood supply
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Thoracodorsal a.
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Rhomboideus major m. - origin/insertion
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O: T2-T5 spinous processes; I: medial border of scapula
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Rhomboideus major m. - actions
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retracts and elevates pectoral girdle, inferiorly rotates scapula
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Rhomboideus major m. - innervation
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Dorsal scapular n.
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Rhomboideus major m. - blood supply
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Dorsal scapular a.
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Rhomboideus minor m. - origin/insertion
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O: C7-T1 spinous processes; I: medial border of scapula superior to rhomboideus major m.
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Rhomboideus minor m. - actions
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retracts and elevates pectoral girdle, inferiorly rotates scapula
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Rhomboideus minor m. - innervation
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Dorsal scapular n. (C5)
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Rhomboideus minor m. - blood supply
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Dorsal scapular a.
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Levator scapulae m. - origin/insertion
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O: Separate slips from posterior tubercles of C1-C4 transverse processes; I: Superior angle of scapula
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Levator scapulae m. - actions
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Protracts and elevates pectoral girdle, inferiorly rotates scapula
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Levator scapulae m. - innervation
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C3-C4 ventral rami via cervical plexus and dorsal scapular n. (C5)
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Levator scapulae m. - blood supply
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Dorsal scapular a.
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Serratus posterior superior m. - origin/insertion
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O: C7-T3 spinous processes; I: Superior borders of ribs 2-5
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Serratus posterior superior m. - actions
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Elevates (weakly) ribs 2-5
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Serratus posterior superior m. - innervation
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Segmentally by ventral primary rami (intercostal nerves)
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Serratus posterior superior m. - blood supply
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Branches of posterior intercostal aa.
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Serratus posterior inferior m. - origin/insertion
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O: T11-L3 spinous processes; I: Inferior borders of ribs 9-12
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Serratus posterior inferior m. - actions
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Depresses (weakly) ribs 9-12
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Serratus posterior inferior m. - innervation
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Segmentally by ventral primary rami (intercostal nn.)
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Serratus posterior inferior m. - blood supply
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Branches of posterior intercostal aa.
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