Muscles connecting the upper extremity to vertebral column

Question 1

Tapezius

Superior, middle & inferior fibers

Answer 1

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

Question 2

Latissimus Dorsi

Answer 2

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

Question 3

Levator Scapulae

Answer 3

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

Question 4

Rhomboid Major

Answer 4

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

Question 5

Rhomboid Minor

Answer 5

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