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Latissimus dorsi Origin
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Latissimus dorsi Insertion
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Back Muscles Up Limb
Axioappendicular Muscle of the Back That are Dissected
| Question | Answer |
|---|---|
| Latissimus dorsi Origin | vertebral spines from T7 to the sacrum, posterior third of the iliac crest, lower 3 or 4 ribs, sometimes from the inferior angle of the scapula |
| Latissimus dorsi Insertion | floor of the intertubercular groove |
| Latissimus dorsi Action | extends the arm and rotates the arm medially |
| Latissimus dorsi Innervation | thoracodorsal nerve (C7,8) from the posterior cord of the brachial plexus |
| Latissimus dorsi Artery | thoracodorsal a. |
| What is a unique feature of the inserting end of the Latissimus dorsi | the inserting tendon twists so that fibers originating highest insert lowest and vice versa |
| Levator scapulae Origin | transverse processes of C1-C4 vertebrae |
| Levator scapulae Insertion | medial border of the scapula from the superior angle to the spine |
| Levator scapulae Action | elevates the scapula |
| Levator scapulae Innervation | dorsal scapular nerve (C5); the upper part of the muscle receives branches of C3 & C4 |
| Levator scapulae Artery | dorsal scapular a. |
| Rhomboideus major Origin | spines of vertebrae T2-T5 |
| Rhomboideus major Insertion | medial border of the scapula inferior to the spine of the scapula |
| Rhomboideus major Action | retracts, elevates and rotates the scapula inferiorly |
| Rhomboideus major Innervation | dorsal scapular nerve (C5) |
| Rhomboideus major Artery | dorsal scapular a. |
| Rhomboideus minor Origin | inferior end of the ligamentum nuchae, spines of vertebrae C7 and T1 |
| Rhomboideus minor Insertion | medial border of the scapula at the root of the spine of the scapula |
| Rhomboideus minor Action | retracts, elevates and rotates the scapula inferiorly |
| Rhomboideus minor Innervation | dorsal scapular nerve (C5) |
| Rhomboideus minor Artery | dorsal scapular a |
| Serratus anterior Origin | ribs 1-8 or 9 |
| Serratus anterior Insertion | medial border of the scapula on its costal (deep) surface |
| Serratus anterior Action | it draws the scapula forward; the inferior fibers rotate the scapula superiorly |
| Serratus anterior Innervation | long thoracic nerve (from ventral rami C5-C7) |
| Serratus anterior Artery | lateral thoracic a. |
| A lesion of the Long Thoracic Nerve will cause what condition? | a lesion of long thoracic nerve will cause winging of the scapula (i.e., the medial border of the scapula falls away from the posterior chest wall and looks like an angel's wing) |
| Trapezius Origin | medial third of the superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of vertebrae C7-T12 |
| Trapezius Insertion | lateral third of the clavicle, medial side of the acromion and the upper crest of the scapular spine, tubercle of the scapular spine |
| Trapezius Action | elevates and depresses the scapula (depending on which part of the muscle contracts); rotates the scapula superiorly; retracts scapula |
| Trapezius Innervation | motor: spinal accessory (XI), proprioception: C3-C4 |
| Trapezius Artery | transverse cervical a. |
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ikosnac
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