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Back Muscles Up Limb

Axioappendicular Muscle of the Back That are Dissected

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.
Created by: ikosnac



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