Extrinsic Muscles Of The Shoulder

Question 1

What are the extrinsic muscles of the shoulder?

Answer 1

Trapezius, latissimus dorsi, levator scapulae, rhomboid major, rhomboid minor

Question 2

Which muscles are superficial/deep?

Answer 2

Superficial= trapezius & latissimus dorsi
Deep= levator scapulae, rhomboid major, rhomboid minor

Question 3

Origin of trapezius

Answer 3

Skull, nuchal ligament and spinous processes of C7-T12

Question 4

Insertion of trapezius

Answer 4

Clavicle, acromion, scapula spine

Question 5

Action of trapezius

Answer 5

Elevate scapula and rotate it during abduction + retract scapula

Question 6

Innervation of trapezius

Answer 6

Accessory nerve

Question 7

Origin of latissimus dorsi

Answer 7

Spinous processes T7-T12, iliac crest, thoracolumbar fascia, inferior 3 ribs

Question 8

Insertion of latissimus dorsi

Answer 8

Intertubercular sulcus of humerus

Question 9

Action of latissimus dorsi

Answer 9

Extends, adducts and medially rotates upper limb

Question 10

Innervation of latissimus dorsi

Answer 10

Thoracodorsal nerve

Question 11

Origin of levator scapulae

Answer 11

Transverse processes of C1-C4 vertebrae

Question 12

Insertion of levator scapulae

Answer 12

Medial border of scapula

Question 13

Actions of levator scapulae

Answer 13

Elevates scapula

Question 14

Innervation of levator scapulae

Answer 14

Dorsal scapular nerve

Question 15

Origin of rhomboid major

Answer 15

Spinous processes T2-T5 vertebrae

Question 16

Insertion of rhomboid major

Answer 16

Medial border of scapula, between scapula spine + inferior angle

Question 17

Action of rhomboid major

Answer 17

Retracts and rotates scapula

Question 18

Innervation of rhomboid major

Answer 18

Dorsal scapular nerve

Question 19

Origin of rhomboid minor

Answer 19

Spinous processes of C7-T1 vertebrae

Question 20

Insertion of rhomboid minor

Answer 20

Medial border of scapula, level of spine of scapula

Question 21

Action of rhomboid minor

Answer 21

Retracts and rotates scapula

Question 22

Innervation of rhomboid minor

Answer 22

Dorsal scapular nerve