Muscles connecting the upper extremity to vertebral column Flashcards
Tapezius
Superior, middle & inferior fibers
O: Occipital bone, ligamentum nuchae & spinous processes of C7-T12
I: Lateral 1/3 of clavicle, spine & acromion of scapula
A: 1. Superior fibers: upward rotation of scapula; can also help to extend the head
2. Middle fibers: Adduction of scapula (retraction)
3. Inferior fibers: Depression & upward rotation of scapula
N: Accessory nerve (CN XI) and cervical pinal nerve C3-C5
Latissimus Dorsi
O: Spinous processes of T7-L5, sacarl crest, iliac crest and inferior 4 ribs
I: Floor of intertubercular groove of humerus
A: Extension, adduction & medial rotation of the humerus bone
N: Thoracodorsal nerve
Levator Scapulae
O: Transverse processes of C1-C4
I: Upper 1/3 of medial border of scapula
A: Elevation & downward rotation of scapula
N: Dorsal scapular nerve and cervical nerve C3-C5
Rhomboid Major
O: Spinous processes T2-T5
I: Lower 1/3 of medial border of scapula
A: Elevation, adduction & downward rotation of scapula; stabilizes scapula
N: Dorsal scapular nerve
Rhomboid Minor
O: Spinous processes of C7-T1
I: Medial border of scapula superior to spine
A: Elevation, adduction & downward rotation of scapula; stabilizes scapula
N: Dorsal scapular nerve