Superficial Extrinsic

Question 1

Trapezius

Answer 1

Origin: external occipital protuberance, superior nuchal line, nuchal ligament, and spinous processes of C7-T12

Insertion: Lateral 1/3 of clavicle, acromion, and spine of scapula

Innervation: Accessory Nerve (CN XI)

Blood Supply: transverse cervical artery, dorsal perforating branches of posterior intercostal arteries

Action: elevates scapula, retracts scapula, rotates scapula, and depresses scapula

Question 2

Latissimus Dorsi

Answer 2

Origin: spinous processes of T7-L5, thoracolumbar fascia, iliac crest, and ribs 9-12

Insertion: intertubercular sulcus of humerus

Innervation: Thoracodorsal nerve

Blood Supply: thoracodorsal artery, dorsal perforating branches of 9th, 10th, and 11th posterior intercostal, subcostal, 1st, 2nd, and 3rd lumbar artery

Action: extends humerus, adducts humerus, and medially rotates humerus

Question 3

Levator Scapulae

Answer 3

Origin: posterior tubercles of transverse processes of C1-C4

Insertion: medial border of scapula and superior angle of scapula

Innervation: ventral rami of C3-C4 and dorsal scapular nerve

Blood Supply: dorsal scapular artery, transverse cervical artery, and ascending cervical artery

Action: elevates scapula, medially rotates glenoid cavity, and inferiorly rotates glenoid cavity

Question 4

Rhomboid Minor

Answer 4

Origin: nuchal ligament and spinous processes of C7-T1

Insertion: medial border of scapula at spine, superiorly

Innervation: dorsal scapular nerve

Blood Supply: dorsal scapular artery

Action: retracts scapula, rotates scapula to depress glenoid cavity, and fixes scapula to thoracic wall

Question 5

Rhomboid Major

Answer 5

Origin: spinous processes of T2-T5

Insertion: medial border of scapula at spine inferiorly

Innervation: dorsal scapular nerve

Blood Supply: dorsal scapular artery

Action: retracts scapula, rotates scapula to depress glenoid cavity, and fixes scapula to thoracic wall