Superficial Back

Question 1

Trapezius

Answer 1

Origin… Superior nuchal line, external occipital protuberance, C7-T12, nuchal ligament

Insertion… Lateral 1/3 of clavicle, acromion process, spine of scapula

Innervation… Accessory nerve

Blood Supply… Transverse cervical

Action… Elevates, retracts, and rotates scapula; lower fibers depress into scapula

Question 2

Latissimus Dorsi

Answer 2

Origin… T7-L5, thoracolumbar fascia, iliac crest, last 3 ribs

Insertion… Intertubercular sulcus of humerus

Innervation… Thoracodorsal nerve

Blood Supply… Thoracodorsal artery

Action… Extends, adducts and medially rotates humerus

Question 3

Rhomboid Major

Answer 3

Origin… T2-T5

Insertion… Medial border of scapula inferior to spine

Innervation… Dorsal scapular nerve

Blood Supply… Dorsal scapular artery

Action… Fixes scapula to thoracic wall, retracts and rotates it to depress into glenoid cavity

Question 4

Rhomboid Minor

Answer 4

Origin… C7-T1

Insertion… Medial border of scapula at the spine

Innervation… Dorsal scapular nerve

Blood Supply… Dorsal scapular nerve

Action… Fixes scapula to thoracic wall, retracts and rotates it to depress into glenoid cavity

Question 5

Levator Scapulae

Answer 5

Origin… Posterior tubercles of transverse processes of C1-C4

Insertion… Medial border of scapula between superior angle and spine

Innervation… Anterior rami of C3-C4, dorsal scapular nerve

Blood Supply… dorsal scapular artery, transverse cervical, ascending cervical artery

Action… elevates scapula medially, inferiorly rotates glenoid fossa