Superficial extrinsic back muscles

Question 1

trapezius O

Answer 1

1. medial third of the superior nuchal line,
2. external occipital protuberance,
3. ligamentum nuchae,
4. spinous processes of vertebrae C7-T12

Question 2

trapezius I

Answer 2

1. lateral third of the clavicle,
2. medial side of the acromion and 3. the upper crest of the scapular spine

Question 3

trapezius action

Answer 3

1. Superior fibers elevate the scapula;
2. lower fibers depress the scapula; middle part retracts scapula;
3. upper and lower fibers work together to rotate the glenoid surface superiorly (arm up movement)

Question 4

trapezius N

Answer 4

1. motor: spinal accessory (XI),
2. proprioception: C3- C4

Question 5

trapezius artery

Answer 5

1. transverse cervical a.;
2. dorsal scapular a.,
3. posterior intercostal a.

Question 6

lat. dorsi. O

Answer 6

1. vertebral spines from T6- 12,
2. thoracolumbar fascia;
3. posterior third of the iliac crest,
4. lower 3 or 4 ribs, sometimes from the inferior angle of the scapula

Question 7

lat. dorsi. I

Answer 7

floor of the intertubercular groove on the humerus

Question 8

lat. dorsi action

Answer 8

extends, adducts, and medially rotates the arm

Question 9

lat. dorsi. innervation

Answer 9

thoracodorsal nerve (C6,7,8)

Question 10

lat. dorsi. artery

Answer 10

1. thoracodorsal a.,
2. dorsal perforating branches of 9th, 10th and 11th posterior intercostal,
3. subcostal and first three lumbar arteries

Question 11

rhomboid major origin

Answer 11

spines of vertebrae t2-t5

Question 12

rhomboid major insertion

Answer 12

medial border of the scapula INFERIOR to the spine of the scapula

Question 13

rhomboid minor origin

Answer 13

inferior end of the ligamentum nuchae
spines of vertebrae C7-T1

Question 14

rhomboid minor insertion

Answer 14

medial border of the scapula at the ROOT of the spine of the scapula

Question 15

rhomboid major/minor action

Answer 15

retracts scapula and rotates the scapula inferiorly

Question 16

rhomboid major/minor artery

Answer 16

dorsal scapular artery

Question 17

levator scapulae origin

Answer 17

posterior tubercles of C1-C4 vertebra

Question 18

levator scapulae insertion

Answer 18

medial border of scapula - spine to the superior angle

Question 19

levator scapulae action

Answer 19

elevates medial part of scapula –> causes an inferior rotation of the glenoid cavity

Question 20

levator scapulae nerve

Answer 20

dorsal scapular nerve (C4,c5)
anterior primary rami of c3 & c4

Question 21

levator scapulae artery

Answer 21

dorsal scapular artery

Question 22

rhomboid major/minor innervation

Answer 22

dorsal scapular nerve (C4,C5)