Occiput, Ligamentum nuchae & spinous processes of C7-T12
Lateral one-third of clavicle, acromion & spine of the scapula
Upper: unilaterally: elevate the scapula (& upwardly rotate), laterally flex head & neck to same side & rotates to opposite side; bilaterally: extend head & neck. Middle: adduct the scapula. Lower: depress the scapula (and upwardly rotates)
Origin: Latissimus dorsi
Spinous processes of last 6 thoracic vertebrae, last 3-4 ribs, thoracolumbar aponeurosis & posterior iliac crest
Insertion: Latissimus dorsi
Crest of the lesser tubercle of the humerus
Action: Latissimus dorsi
Extension, medial rotation and adduction of the shoulder joint (humerus)
Origin: Levator scapula
Transverse processes of C 1-4
Insertion: Levator scapula
Upper region of medial border and superior angle of scapula
Action: Levator scapula
Elevate the scapula (and downwardly rotates)
Origin: Rhomboid Major
Spinous processes of T2-T5
Insertion: Rhomboid Major
Medial border of scapula, between the spine & inferior angle
Origin: Rhomboid Minor
Spinous processes of C7-T1
Insertion: Rhomboid Minor
Upper portion of medial border of scapula, across from spine
Action: Rhomboid Major and Minor
Adduct the scapula (and downwardly rotates)
Origin: Spinalis, Longissimus, Iliocostalis
Sacrum, iliac crest, thoracolumbar aponeurosis.
Thoracic spinous processes up to C2
Ribs, transverse processes up to the mastoid process.
Ribs to cervical transverse processes.
Action: Spinalis, Longissimus, Iliocostalis
Unilaterally: lateral flexion of the spine to the same side; Bilaterally: extension of the spine
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